लिंक्डइन कौशल मूल्यांकन उत्तर और प्रश्न - जावास्क्रिप्ट

यदि आप ढूंढ रहे हैं LinkedIn skill assessment answers तथा प्रशन के लिये जावास्क्रिप्ट, Arduino के साथ हैंड्स-ऑन रोबोटिक्स. इस ब्लॉग पोस्ट में, I will share with you some of the most common and tricky questions that you may encounter in the test, along with the correct answers and explanations.

By reading this post, you will not only learn how to ace the लिंक्डइन कौशल मूल्यांकन के लिये जावास्क्रिप्ट but also improve your knowledge and skills in this popular programming language. Read on to find out more!

Assessment link(लिंक्डइन)

Q1. Which operator returns true if the two compared values are not equal?

<>
~
==!
!==

Reference Javascript Comparison Operators

Q2. How is a forEach statement different from a for statement?

Only a for statement uses a callback function.
A for statement is more generic and can be used with various iterable objects, while a forEach statement is mainly designed for arrays but can also be used with other iterable objects like Sets.
Only a forEach statement lets you specify your own iterator.
A forEach statement is generic, but a for statement can be used only with an array.

Reference Differences between forEach and for loop

Q3. नीचे दिए गए कोड की समीक्षा करें. Which statement calls the addTax function and passes 50 as an argument?

function addTax(total) {
  return total * 1.05;
}

addTax = 50;
return addTax 50;
addTax(50);
addTax 50;

Reference functions in javascript

Q4. Which statement is the correct way to create a variable called rate and assign it the value 100?

let rate = 100;
let 100 = rate;
100 = let rate;
rate = 100;

Reference Javascript Assignment operators

Q5. Which statement creates a new object using the Person constructor? Which statement creates a new Person object called “छात्र”?

var student = new Person();
var student = construct Person;
var student = Person();
var student = construct Person();

संदर्भ

Q6. When would the final statement in the code shown be logged to the console? When would ‘results shown’ be logged to the console?

let modal = document.querySelector('#result');
setTimeout(function () {
  modal.classList.remove('hidden');
}, 10000);
console.log('Results shown');

बाद 10 दूसरा
after results are received from the HTTP request
बाद 10000 यदि आप ऑडियो को किसी अन्य स्पीकर - या हियरिंग एड में स्थानांतरित करना पसंद करते हैं
तुरंत

Reference Javascript is synchronous and single threaded

क्यू 7. Which snippet could you add to this code to print “खाना” to the console?

class Animal {
  static belly = [];
  eat() {
    Animal.belly.push('food');
  }
}
let a = new Animal();
a.eat();
console.log(/* Snippet Here */); //Prints food

a.prototype.belly[0]
Object.getPrototype0f (a).belly[0]
Animal.belly[0]
a.belly[0]

Reference Javascript Class static Keyword

क्यू 8. You’ve written the code shown to log a set of consecutive values, but it instead results in the value 5, 5, 5, तथा 5 being logged to the console. Which revised version of the code would result in the value 1, 2, 3 तथा 4 being logged?

for (var i = 1; i <= 4; i++) {
  setTimeout(function () {
    console.log(i);
  }, i * 10000);
}

for (var i = 1; i <= 4; i++) {
  (function (i) {
    setTimeout(function () {
      console.log(j);
    }, j * 1000);
  })(j);
}

for (var i = 1; i <= 4; i++) {
  setTimeout(function () {
    console.log(i);
  }, i * 1000);
}

for (var i = 1; i <= 4; i++) {
  (function (j) {
    setTimeout(function () {
      console.log(j);
    }, j * 1000);
  })(i);
}

for (var j = 1; j <= 4; j++) {
  setTimeout(function () {
    console.log(j);
  }, j * 1000);
}

प्रश्न 9. How does a function create a closure?

It reloads the document whenever the value changes.
It returns a reference to a variable in its parent scope.
It completes execution without returning.
It copies a local variable to the global scope.

संदर्भ

प्र10. Which statement creates a new function called discountPrice?

let discountPrice = function (price) {
  return price * 0.85;
};

let discountPrice(price) {
  return price * 0.85;
};

let function = discountPrice(price) {
  return price * 0.85;
};

discountPrice = function (price) {
  return price * 0.85;
};

Reference defining javascript functions

प्रश्न 11. What is the result in the console of running the code shown?

var Storm = function () {};
Storm.prototype.precip = 'rain';
var WinterStorm = function () {};
WinterStorm.prototype = new Storm();
WinterStorm.prototype.precip = 'snow';
var bob = new WinterStorm();
console.log(bob.precip);

Storm()
undefined
‘rain’
‘snow’

Reference prototype chain

प्र12. You need to match a time value such as 12:00:32. Which of the following regular expressions would work for your code?

/[0-9]{2,}:[0-9]{2,}:[0-9]{2,}/
/\d\d:\d\d:\d\d/
/[0-9]+:[0-9]+:[0-9]+/
/ : : /

टिप्पणी: The first three are all partially correct and will match digits, लेकिन second option is the most correct because it will केवल मिलान 2 digit time values (12:00:32). The first option would have worked if the repetitions range looked like [0-9]{2}, however because of the comma [0-9]{2,} it will select 2 मकड़ियाँ इन संरचनाओं का उपयोग अपने शिकार को पकड़ने और मारने के लिए करती हैं पिछले दशक के लिए त्वरित सीखने की दुनिया की (120:000:321). The third option will any range of time digits, एक तथा विभिन्न (अर्थ 1:2:3 will also match).

More resources:

प्रश्न 13. What is the result in the console of running this code?

'use strict';
function logThis() {
  this.desc = 'logger';
  console.log(this);
}
new logThis();

undefined
window
{desc: "logger"}
function

Reference javascript classes

प्र14. How would you reference the text ‘avenue’ in the code shown?

let roadTypes = ['street', 'road', 'avenue', 'circle'];

roadTypes.2
roadTypes[3]
roadTypes.3
roadTypes[2]

Reference accessing javascript arrays

प्रश्न 15. What is the result of running this statement?

console.log(typeof 42);

'float'
'value'
'number'
'integer'

Reference javascript data types

प्र16. Which property references the DOM object that dispatched an event?

self
object
target
source

Reference DOM events

प्रश्न 17. You’re adding error handling to the code shown. Which code would you include within the if statement to specify an error message?

function addNumbers(x, y) {
  if (isNaN(x) || isNaN(y)) {
  }
}

exception('One or both parameters are not numbers')
catch('One or both parameters are not numbers')
error('One or both parameters are not numbers')
throw('One or both parameters are not numbers')

Reference javascript throw

प्रश्न 18. Which method converts JSON data to a JavaScript object?

JSON.fromString();
JSON.parse()
JSON.toObject()
JSON.stringify()

Reference convert json to javascript object

क्यू19. When would you use a conditional statement?

When you want to reuse a set of statements multiple times.
When you want your code to choose between multiple options.
When you want to group data together.
When you want to loop through a group of statement.

Reference javascript conditionals

प्र20. What would be the result in the console of running this code?

for (var i = 0; i < 5; i++) {
  console.log(i);
}

1 2 3 4 5
1 2 3 4
0 1 2 3 4
0 1 2 3 4 5

Reference javascript for loops

प्र21. Which Object method returns an iterable that can be used to iterate over the properties of an object?

Object.get()
Object.loop()
Object.each()
Object.keys()

Reference javascript object static methods

प्र22. What will be logged to the console?

var a = ['dog', 'cat', 'hen'];
a[100] = 'fox';
console.log(a.length);

प्र23. What is one difference between collections created with Map and collections created with Object?

You can iterate over values in a Map in their insertion order.
You can count the records in a Map with a single method call.
Keys in Maps can be strings.
You can access values in a Map without iterating over the whole collection.

Explanation: Map.prototype.size returns the number of elements in a Map, whereas Object does not have a built-in method to return its size. Reference map methods javascript

प्र24. What is the value of dessert.type after executing this code?

const dessert = { type: 'pie' };
dessert.type = 'pudding';

pie
The code will throw an error.
pudding
undefined

Reference working with js objects

प्रश्न25. 0 && नमस्ते

ReferenceError
सच
0
असत्य

Reference boolean logic

प्र26. Which of the following operators can be used to do a short-circuit evaluation?

++
--
==
||

Reference short circuit javascript

प्र27. Which statement sets the Person constructor as the parent of the Student constructor in the prototype chain?

Student.parent = Person;
Student.prototype = new Person();
Student.prototype = Person;
Student.prototype = Person();

Reference prototype object js

प्रश्न 28. Why would you include a “use strict” statement in a JavaScript file?

to tell parsers to interpret your JavaScript syntax loosely
to tell parsers to enforce all JavaScript syntax rules when processing your code
to instruct the browser to automatically fix any errors it finds in the code
to enable ES6 features in your code

Reference what is use strict in js

प्र29. Which Variable-defining keyword allows its variable to be accessed (as undefined) before the line that defines it?

all of them
const
var
let

Reference var vs let vs const in js

क्यू30. Which of the following values is not a Boolean false?

Boolean(0)
Boolean("")
Boolean(NaN)
Boolean("false")

Reference boolean of a string

प्रश्न31. Which of the following is not a keyword in JavaScript?

this
catch
function
array

Reference js reserved words

प्र32. Which variable is an implicit parameter for every function in JavaScript?

Arguments
args
argsArray
argumentsList

Reference implicit js parameters for functions

प्रश्न 33. For the following class, how do you get the value of 42 from an instance of X?

class X {
  get Y() {
    return 42;
  }
}
var x = new X();

x.get('Y')
x.Y
x.Y()
x.get().Y

Reference getters

प्रश्न34. What is the result of running this code?

sum(10, 20);
diff(10, 20);
function sum(x, y) {
  return x + y;
}

let diff = function (x, y) {
  return x - y;
};

30, ReferenceError, 30, -10
30, ReferenceError
30, -10
ReferenceError, -10

Reference accessing before initialization

क्यू35. Why is it usually better to work with Objects instead of Arrays to store a collection of records?

Objects are more efficient in terms of storage.
Adding a record to an object is significantly faster than pushing a record into an array.
Most operations involve looking up a record, and objects can do that better than arrays.
Working with objects makes the code more readable.

Reference efficiency of lookups Explanation: Records in an object can be retrieved using their key which can be any given value (उदाहरण के लिए:. an employee ID, a city name, आदि), whereas to retrieve a record from an array we need to know its index.

प्र36. Which statement is true about the “async” attribute for the HTML script tag?

It can be used for both internal and external JavaScript code.
It can be used only for internal JavaScript code.
It can be used only for internal or external JavaScript code that exports a promise.
It can be used only for external JavaScript code.

Reference async attribute for html

प्रश्न37. How do you import the lodash library making it top-level Api available as the “_” variable?

import _ from 'lodash';
import 'lodash' as _;
import '_' from 'lodash;
import lodash as _ from 'lodash';

Reference how to import library in js

प्रश्न 38. What does the following expression evaluate to?

[] == [];

सच
undefined
[]
असत्य

Reference arrays in js are objects

प्र39. What type of function can have its execution suspended and then resumed at a later point?

Generator function
Arrow function
Async/ Await function
Promise function

Reference what are generators in nodejs

क्यू40. What will this code print?

var v = 1;
var f1 = function () {
  console.log(v);
};

var f2 = function () {
  var v = 2;
  f1();
};

f2();

2
1
कुछ नहीं – this code will throw an error.
undefined

Reference closures in js / nested functions

प्र41. Which statement is true about Functional Programming?

Every object in the program has to be a function.
Code is grouped with the state it modifies.
Date fields and methods are kept in units.
Side effects are not allowed.

Reference functional programming

प्र42. Your code is producing the error: TypeError: Cannot read property ‘reduce’ of undefined. यह जानने के लिए कि क्या आपने प्रश्न का सही उत्तर दिया है?

You are calling a method named reduce on an object that’s declared but has no value.
You are calling a method named reduce on an object that does not exist.
You are calling a method named reduce on an empty array.
You are calling a method named reduce on an object that has a null value.

Explanation: You cannot invoke reduce on undefined object... It will throw (yourObject is not Defined...)

प्रश्न 43. How many prototype objects are in the chain for the following array?

let arr = [];

Reference array prototype

प्रश्न 44. Which choice is नहीं a unary operator?

typeof
delete
instanceof
void

Reference js unary operators

क्यू45. What type of scope does the end variable have in the code shown?

var start = 1;
if (start === 1) {
  let end = 2;
}

conditional
block
वैश्विक
समारोह

Reference block vs function scope

प्र46. What will the value of y be in this code:

const x = 6 % 2;
const y = x ? 'One' : 'Two';

एक
undefined
सत्य
Two

Reference ternary operator js

प्रश्न 47. Which keyword is used to create an error?

throw
exception
catch
error

Reference throwing errors in js

प्रश्न 48. What’s one difference between the async and defer attributes of the HTML script tag?

The defer attribute can work synchronously.
The defer attribute works only with generators.
The defer attribute works only with promises.
The defer attribute will asynchronously load the scripts in order.

Reference async vs defer

प्र49. The following program has a problem. यह क्या है?

var a;
var b = (a = 3) ? true : false;

The condition in the ternary is using the assignment operator.
You can’t define a variable without initializing it.
You can’t use a ternary in the right-hand side of an assignment operator.
The code is using the deprecated var keyword.

Reference ternary operator js

क्यू50. Which statement references the DOM node created by the code shown?

<p class="pull">lorem ipsum</p>

Document.querySelector('class.pull')
document.querySelector('.pull');
Document.querySelector('pull')
Document.querySelector('#pull')

Reference query selector

प्रश्न51. What value does this code return?

let answer = true;
if (answer === false) {
  return 0;
} else {
  return 10;
}

10
सच
असत्य
0

Reference javascript conditionals

प्रश्न52. What is the result in the console of running the code shown?

var start = 1;
function setEnd() {
  var end = 10;
}
setEnd();
console.log(end);

10
0
ReferenceError
undefined

संदर्भ

प्रश्न53. What will this code log in the console?

function sayHello() {
  console.log('hello');
}

console.log(sayHello.prototype);

undefined
“hello”
an object with a constructor property
an error message

Reference prototypes

प्रश्न54. Which collection object allows unique value to be inserted only once?

Object
तय करना
सरणी
नक्शा

Reference javascript sets

प्रश्न55. What two values will this code print?

function printA() {
  console.log(answer);
  var answer = 1;
}
printA();
printA();

1 फिर 1
1 फिर undefined
undefined फिर undefined
undefined फिर 1

संदर्भ

प्रश्न56. How does the `forEach()` method differ from a `for` कथन?

forEach allows you to specify your own iterator, whereas for does not.
forEach can be used only with strings, whereas for can be used with additional data types.
forEach can be used only with an array, whereas for can be used with additional data types.
for loops can be nested; whereas forEach loop cannot.

Reference Differences between forEach and for loop

प्रश्न57. Which choice is an incorrect way to define an arrow function that returns an empty object?

लाभ कमाने के लिए मुझे इस वस्तु का कितना हिस्सा बेचने की आवश्यकता है> ({})
लाभ कमाने के लिए मुझे इस वस्तु का कितना हिस्सा बेचने की आवश्यकता है> {}
लाभ कमाने के लिए मुझे इस वस्तु का कितना हिस्सा बेचने की आवश्यकता है> { return {};}
लाभ कमाने के लिए मुझे इस वस्तु का कितना हिस्सा बेचने की आवश्यकता है> (({}))

Reference arrow functions

प्र 58. Why might you choose to make your code asynchronous?

to start tasks that might take some time without blocking subsequent tasks from executing immediately
to ensure that tasks further down in your code are not initiated until earlier tasks have completed
to make your code faster
to ensure that the call stack maintains a LIFO (Last in, First Out) संरचना

EXPLANATION: "to ensure that tasks further down in your code are not initiated until earlier tasks have completed" you use the normal (synchronous) flow where each command is executed sequentially. Asynchronous code allows you to break this sequence: start a long running function (AJAX call to an external service) and continue running the rest of the code in parallel.

प्रश्न59. Which expression evaluates to true?

[3] == [3]
3 == '3'
3 != '3'
3 === '3'

क्यू 60. Which of these is a valid variable name?

5thItem
firstName
grand total
समारोह

Reference coding conventions

प्रश्न 61. Which method cancels event default behavior?

cancel()
stop()
preventDefault()
prevent()

Reference javascript events

प्रश्न 62. Which method do you use to attach one DOM node to another?

attachNode()
getNode()
querySelector()
appendChild()

Reference Node interface

प्रश्न 63. What statement can be used to skip an iteration in a loop?

break
pass
skip
continue

Reference break vs continue

प्रश्न 64. Which choice is a valid example for an arrow function?

(a,b) => c
a, b => {return c;}
a, b => c
{ a, b } => c

Reference arrow functions

प्रश्न 65. Which concept is defined as a template that can be used to generate different objects that share some shape and/or behavior?

कक्षा
generator function
नक्शा
proxy

Reference javascript classes

प्रश्न 66. How do you add a comment to JavaScript code?

! This is a comment
# This is a comment
\\ This is a comment
// This is a comment

Reference comments in javascript

प्रश्न 67. If you attempt to call a value as a function but the value is not a function, what kind of error would you get?

TypeError
SystemError
SyntaxError
LogicError

Reference javascript errors

प्रश्न 68. Which method is called automatically when an object is initialized?

बनाएं()
नया()
constructor()
init()

Reference javascript constructors

प्रश्न 69. What is the result of running the statement shown?

let a = 5;
console.log(++a);

Reference ++x vs x++

क्यू 70. You’ve written the event listener shown below for a form button, but each time you click the button, the page reloads. Which statement would stop this from happening?

button.addEventListener(
  'click',
  function (e) {
    button.className = 'clicked';
  },
  false,
);

e.blockReload();
button.preventDefault();
button.blockReload();
e.preventDefault();

Reference events in javascript

प्र71. Which statement represents the starting code converted to an IIFE?

function() { console.log('lorem ipsum'); }()();
function() { console.log('lorem ipsum'); }();
(function() { console.log('lorem ipsum'); })();

Reference what is an Immediately Invoked Function Expression

प्र72. Which statement selects all img elements in the DOM tree?

Document.querySelector('img')
Document.querySelectorAll('<img>')
Document.querySelectorAll('img')
Document.querySelector('<img>')

Reference query selector

प्रश्न 73. Why would you choose an asynchronous structure for your code?

To use ES6 syntax
To start tasks that might take some time without blocking subsequent tasks from executing immediately
To ensure that parsers enforce all JavaScript syntax rules when processing your code
To ensure that tasks further down in your code aren’t initiated until earlier tasks have completed

Reference async function

प्रश्न 74. What is the HTTP verb to request the contents of an existing resource?

DELETE
GET
PATCH
POST

Reference http methods

प्रश्न 75. Which event is fired on a text field within a form when a user tabs to it, or clicks or touches it?

focus
blur
मंडराना
प्रवेश करना

Reference javascript events

प्रश्न 76. What is the result in the console of running this code?

function logThis() {
  console.log(this);
}
logThis();

समारोह
undefined
Function.prototype
खिड़की

Reference what is the javascript window

प्र77. Which class-based component is equivalent to this function component?

const Greeting = ({ name }) => <h1>Hello {name}!</h1>;

class Greeting extends React.Component { render() { return <h1>Hello {this.props.name}!</h1>; } }
class Greeting extends React.Component { constructor() { return <h1>Hello {this.props.name}!</h1>; } }
class Greeting extends React.Component { <h>Hello {this.props.name}!</h>; } }
class Greeting extends React.Component { render({ name }) { return <h1>Hello {name}!</h1>; } }

प्र79. What is the output of this code?

var obj;
console.log(obj);

ReferenceError: obj is not defined
{}
undefined
null

Reference working with objects

क्यू 80. How would you use the TaxCalculator to determine the amount of tax on $50?

class TaxCalculator {
  static calculate(total) {
    return total * 0.05;
  }
}

calculate(50);
new TaxCalculator().calculate($50);
TaxCalculator.calculate(50);
new TaxCalculator().calculate(50);

Reference functions in javascript

क्यू81. What is wrong with this code?

const foo = {
  bar() {
    console.log('Hello, world!');
  },
  name: 'Albert',
  age: 26,
};

The function bar needs to be defined as a key/value pair.
Trailing commas are not allowed in JavaScript.
Functions cannot be declared as properties of objects.
कुछ नहीं, there are no errors.

प्रश्न 82. What will be logged to the console?

console.log('I');
setTimeout(() => {
  console.log('love');
}, 0);
console.log('Javascript!');

I
Javascript!
love

love
I
Javascript!

The output may change with each execution of code and cannot be determined.
.

I
love
Javascript!

संदर्भ https://developer.mozilla.org/en-US/docs/Web/API/setTimeout#reasons_for_delays_longer_than_specified especially see the ‘late timeouts’ अधिकांश लोग स्कूल में पढ़ने का एक विस्तृत खेल खेलना सीखते हैं.

क्यू 83. What will this code log to the console?

const foo = [1, 2, 3];
const [n] = foo;
console.log(n);

1
undefined
NaN
कुछ नहीं–this is not proper JavaScript syntax and will throw an error.

Reference array deconstruction

प्रश्न 84. How do you remove the property name from this object?

const foo = {
  name: 'Albert',
};

delete name from foo;
delete foo.name;
del foo.name;
remove foo.name;

Reference working with objects

क्यू85. में क्या अंतर है `map()` और यह `forEach()` methods on the Array prototype?

There is no difference.
NS forEach() method returns a single output value, whereas the map() method performs operation on each value in the array.
The map() method returns a new array with a transformation applied on each item in the original array, whereas the forEach() method iterates through an array with no return value.
NS forEach() method returns a new array with a transformation applied on each item in the original array, whereas the map() method iterates through an array with no return value.

क्यू 86. Which concept does this code illustrate?

function makeAdder(x) {
  return function (y) {
    return x + y;
  };
}

var addFive = makeAdder(5);
console.log(addFive(3));

overloading
closure
currying
overriding

Reference currying

क्यू87. Which tag pair is used in HTML to embed JavaScript?

<script></script>
<js></js>
<javascript></javascript>
<code></code>

Reference add js to html file

क्यू88. If your app receives data from a third-party API, which HTTP response header must the server specify to allow exceptions to the same-origin policy?

Security-Mode
Access-Control-Allow-Origin
Different-Origin
Same-Origin

Reference Cross-Origin Resource Sharing

क्यू 89. What is the output of this code?

let rainForests = ['Amazon', 'Borneo', 'Cerrado', 'Congo'];
rainForests.splice(0, 2);
console.log(rainForests);

["Amazon","Borneo","Cerrado","Congo"]
["Cerrado", "Congo"]
["Congo"]
["Amazon","Borneo"]

Reference array methods

Q90. Which missing line would allow you to create five variables(एक,दो,तीन,चार,five) that correspond to their numerical values (1,2,3,4,5)?

const numbers = [1, 2, 3, 4, 5];
//MISSING LINE

const [one,two,three,four,five]=numbers
const {one,two,three,four,five}=numbers
const [one,two,three,four,five]=[numbers]
const {one,two,three,four,five}={numbers}

Reference array destructuring

प्रश्न91. What will this code print?

const obj = {
  a: 1,
  b: 2,
  c: 3,
};

const obj2 = {
  ...obj,
  a: 0,
};

console.log(obj2.a, obj2.b);

कुछ नहीं, it will throw an error
0 2
undefined 2
undefined 2

Reference spread syntax es6

प्रश्न92. Which line could you add to this code to print “jaguar” to the console?

let animals = ['jaguar', 'eagle'];
//Missing Line
console.log(animals.pop()); //Prints jaguar

animals.filter(e => e === "jaguar");
animals.reverse();
animals.shift();
animals.pop();

Reference Javascript Array pop()

shift() – removes the FIRST element of an array and returns the removed item.

pop() – removes the LAST element of an array and returns the removed item.

reverse() – reverses the order of the elements in an array.

फ़िल्टर() – get every element in the array that meets the condition.

प्रश्न93. What line is missing from this code?

//Missing Line
for (var i = 0; i < vowels.length; i++) {
  console.log(vowels[i]);
  //Each letter printed on a separate line as follows;
  //a
  //e
  //i
  //o
  //u
}

let vowels = "aeiou".toArray();
let vowels = Array.of("aeiou");
let vowels = {"a", "e", "i", "o", "u"};
let vowels = "aeiou";

Reference working with arrays

प्रश्न94. What will be logged to the console?

const x = 6 % 2;
const y = x ? 'One' : 'Two';
console.log(y);

undefined
एक
सच
Two

ध्यान दें: this question is same with Q46. Reference ternary operator js

प्रश्न95. How would you access the word It from this multidimensional array?

let matrix = [["You","Can"],["Do","It"],["!","!","!"]];

matrix[1[2]]
matrix[1][1]
matrix[1,2]
matrix[1][2]

प्रश्न96. What does this code do?

const animals = ['Rabbit', 'Dog', 'Cat'];
animals.unshift('Lizard');

It adds “Lizard” to the start of the animals array.
It adds “Lizard” to the end of the animals array.
It replaces “Rabbit” साथ “Lizard” in the animals array.
It replaces “Cat” साथ “Lizard” in the animals array.

Reference working with arrays

प्रश्न97. What is the output of this code?

let x = 6 + 3 + '3';
console.log(x);

Reference type coercion

प्रश्न98. Which statement can take a single expression as input and then look through a number of choices until one that matches that value is found?

अन्य
जब
यदि
यदि आप त्वरित शिक्षण सिखा रहे हैं

Reference switch

प्रश्न99. Which statement prints “roar” to the console?

var sound = 'grunt';
var bear = { sound: 'roar' };
function roar() {
  console.log(this.sound);
}

bear.bind(roar);
roar.bind(bear);
roar.apply(bear);
bear[roar]();

Q100. Which choice is a valid example of an arrow function, assuming c is defined in the outer scope?

a, b => { return c; }
a, b => c
{ a, b } => c
(a,b) => c

Reference arrow functions

Q101. Which statement correctly imports this code from some-file.js?

//some-file.js
export const printMe = (str) => console.log(str);

import printMe from './some-file';
import { printMe } from './some-file';
import default as printMe from './some-file';
const printMe = import './some-file';

Reference importing libraries in javascript

Q102. What will be the output of this code?

const arr1 = [2, 4, 6];
const arr2 = [3, 5, 7];

console.log([...arr1, ...arr2]);

Reference spread syntax

Q103. Which method call is chained to handle a successful response returned by `fetch()`?

done()
then()
finally()
catch()

Reference fetch

क्यू104. Which choice is not an array method?

array.slice()
array.shift()
array.push()
array.replace()

Reference working with arrays

क्यू105. Which JavaScript loop ensures that at least a singular iteration will happen?

do…while
forEach
जबकि
के लिये

Reference loops in js

Q106. What will be logged to the console?

console.log(typeof 'blueberry');

string
array
Boolean
object

Reference what is typeof

Q107. What is the output that is printed when the div containing the text “Click Here” is clicked?

//HTML Markup
<div id="A">
  <div id="B">
    <div id="C">Click Here</div>
  </div>
</div>

//JavaScript
document.querySelectorAll('div').forEach((e) => {
  e.onclick = (e) => console.log(e.currentTarget.id);
});

C B A
ए
सी
A B C

Q108. What will this code log to the console?

const myNumbers = [1, 2, 3, 4, 5, 6, 7];
const myFunction = (arr) => {
  return arr.map((x) => x + 3).filter((x) => x < 7);
};
console.log(myFunction(myNumbers));

[4,5,6,7,8,9,10]
[4,5,6,7]
[1,2,3,4,5,6]
[4,5,6]

Reference functions in javascript

Q109. What does this code print to the console?

let rainForestAcres = 10;
let animals = 0;

while (rainForestAcres < 13 || animals <= 2) {
  rainForestAcres++;
  animals += 2;
}

console.log(animals);

Reference MDN JavaScript Looping code

Q110. Which snippet could you add to this code to print “YOU GOT THIS” to the console?

let cipherText = [...'YZOGUT QGMORTZ MTRHTILS'];
let plainText = '';

/* Missing Snippet */

console.log(plainText); //Prints YOU GOT THIS

for (let key of cipherText.keys()) {
  plainText += key % 2 === 0 ? key : ' ';
}

बी

for (let [index, value] of cipherText.entries()) {
  plainText += index % 2 !== 0 ? value : '';
}

सी

for (let [index, value] of cipherText.entries()) {
  plainText += index % 2 === 0 ? value : '';
}

डी

for (let value of cipherText) {
  plainText += value;
}

प्रश्न111. Which Pokemon will be logged to the console?

var pokedex = ['Snorlax', 'Jigglypuff', 'Charmander', 'Squirtle'];
pokedex.pop();
console.log(pokedex.pop());

Charmander
Jigglypuff
Snorlax
Squirtle

Explanation: The pop() method removes the last element from an array and returns that element. This method changes the length of the array.

Reference Array.pop

Q112. Which statement can be used to select the element from the DOM containing the text “The LinkedIn Learning library has great JavaScript courses” from this markup?

<h1 class="content">LinkedIn Learning</h1>
<div class="content">
  <span class="content">The LinkedIn Learning library has great JavaScript courses!</span>
</div>

document.querySelector(“div.content”)
document.querySelector(“span.content”)
document.querySelector(“.ऐसे कई तरीके हैं जिनसे खोज इंजन अनुकूलन को बेहतर बनाने के लिए कीवर्ड का उपयोग किया जा सकता है”)
document.querySelector(“div.span”)

प्रश्न 113. Which value is not falsey?

[]
undefined
0
null

Reference Falsy

प्रश्न114. What line of code causes this code segment to throw an error?

const lion = 1;
let tiger = 2;
var bear;

++lion;
bear += lion + tiger;
tiger++;

line 5, because lion cannot be reassigned a value
line 6, because the += operator cannot be used with the undefined variable bear
line 5, because the prefix (++) operator does not exist in JavaScript
line 3, because the variable bear is left undefined

प्रश्न 115. What will be the value of `result` after running this code?

const person = { name: 'Dave', age: 40, hairColor: 'blue' };
const result = Object.keys(person).map((x) => x.toUpperCase());

It will throw a TypeError.
["Name", "Age", "HairColor"]
["DAVE", 40, "BLUE"]
["NAME", "AGE", "HAIRCOLOR"]

प्रश्न116. Which snippet could you insert to this code to print “तैरना” to the console?

let animals = ["eagle", "osprey", "salmon"];
let key = animal => animal === "salmon";

if(/* Insert Snippet Here */){
  console.log("swim");
}

animals.every(key)
animals.some(key).length === 1
animals.filter(key) === true
animals.some(key)

Reference Array.prototype.some

प्रश्न117. What is the output of this code?

class RainForest {
  static minimumRainFall = 60;
}

let congo = new RainForest();
RainForest.minimumRainFall = 80;
console.log(congo.minimumRainFall);

undefined
None of these answers, as static is not a feature in Javascript.
60
80

Reference Classes static

प्रश्न118. How can you attempt to access the property `a.b` पर `obj` without throwing an error if a is undefined?

let obj = {};

obj?.a.b
obj.a?.b
obj[a][b]
obj.?a.?b

Reference Optional chaining (?.)

प्रश्न119. What happens when you run this code?

if (true) {
  var x = 5;
  const y = 6;
  let z = 7;
}
console.log(x + y + z);

It will throw a ReferenceError के बारे में x.
It will print 18.
It will print undefined.
It will throw a ReferenceError के बारे में y.

Reference let statement

Q120. What does this code print to the console?

const x = [1, 2];
const y = [5, 7];
const z = [...x, ...y];
console.log(z);

[1,2,5,7]
[[1, 2], [5, 7]]
[2,7]
[2,1,7,5]

Reference spread syntax (…)

प्रश्न121. Given this code, which statement will be evaluated as false?

const a = { x: 1 };
const b = { x: 1 };

a['x'] === b['x']
a != b
a === b
a.x === b.x

संदर्भ

प्रश्न122. What will this code log to the console?

console.log(typeof 41.1);

Nothing. It resuults in a ReferenceError.
decimal
float
number

संदर्भ

प्रश्न123. What is the output of this code?

let scores = [];
scores.push(1, 2);
scores.pop();
scores.push(3, 4);
scores.pop();
score = scores.reduce((a, b) => a + b);
console.log(score);

प्रश्न124. What does this code print to the console?

let bear = {
  sound: 'roar',
  roar() {
    console.log(this.sound);
  },
};

bear.sound = 'grunt';
let bearSound = bear.roar;
bearSound();

Nothing is printed to the console.
grunt
undefined
roar

संदर्भ

प्रश्न125. What is the output of this code?

var cat = { name: 'Athena' };

function swap(feline) {
  feline.name = 'Wild';
  feline = { name: 'Tabby' };
}

swap(cat);
console.log(cat.name);

undefined
Wild
Tabby
Athena

प्रश्न126. What will this code output to the log?

var thing;
let func = (str = 'no arg') => {
  console.log(str);
};
func(thing);
func(null);

null no arg
no arg no arg
null null
no arg null

प्रश्न127. What will this code print to the console?

const myFunc = () => {
  const a = 2;
  return () => console.log('a is ' + a);
};
const a = 1;
const test = myFunc();
test();

a is 1
a is undefined
It won’t print anything.
a is 2

प्रश्न128. What will this code print to the console?

const myFunc = (num1, num2 = 2, num3 = 2) => {
  return num1 + num2 + num3;
};
let values = [1, 5];
const test = myFunc(2, ...values);
console.log(test);

Q129. Which code would you use to access the Irish flag?

var flagsJSON =
  '{ "countries" : [' +
  '{ "country":"Ireland" , "flag":"🇮🇪" },' +
  '{ "country":"Serbia" , "flag":"🇷🇸" },' +
  '{ "country":"Peru" , "flag":"🇵🇪" } ]}';

var flagDatabase = JSON.parse(flagsJSON);

flagDatabase.countries[1].flag
flagDatabase.countries[0].flag
flagDatabase[1].flag
flagsJSON.countries[0].flag

प्रश्न130. Which snippet allows the acresOfRainForest variable to increase?

let conservation = true;
let deforestation = false;
let acresOfRainForest = 100;
if (/* Snipped goes here */){
    ++acresOfRainForest;
}

संरक्षण && !वनों की कटाई
!वनों की कटाई && !संरक्षण
!संरक्षण || वनों की कटाई
वनों की कटाई && संरक्षण || वनों की कटाई

प्रश्न131. Which of these evaluate to true?

Boolean(“असत्य”)
Boolean(“”)
Boolean(0)
Boolean(NaN)

प्रश्न132. How would you add a data item named animal with a value of sloth to local storage for the current domain?

LocalStorage.setItem(“जानवर”,”sloth”);
document.localStorage.setItem(“जानवर”,”sloth”);
localStorage.setItem({जानवर:”sloth”});
localStorage.setItem(“जानवर”,”sloth”);

संदर्भ

प्रश्न133. What value is printed to the console after this code execute?

let cat = Object.create({ type: 'lion' });
cat.size = 'large';

let copyCat = { ...cat };
cat.type = 'tiger';

console.log(copyCat.type, copyCat.size);

tiger large
lion undefined
undefined large
lion large

संदर्भ

प्रश्न134. What does this code print to the console?

let animals = [{ type: 'lion' }, 'tiger'];
let clones = animals.slice();

clones[0].type = 'bear';
clones[1] = 'sheep';

console.log(animals[0].type, clones[0].type);
console.log(animals[1], clones[1]);

bear bear tiger sheep
lion bear sheep sheep
bear bear tiger tiger
lion bear tiger sheep

संदर्भ

प्रश्न135. What will be the output of the following code?

a=5;
b=4;
alert(a++(+(+(+b))));

प्रश्न136. Which snippet could you add to this code to print “{“प्रकार”: “А मादा बंगाल टाइगर ने दिया जन्म”}” to the console?

let cat = { type: "tiger", size: "large" };

let json = /* Snippet here */;

console.log(json); // print {"type":"tiger"}

cat.toJSON("type");
JSON.stringify(cat, ["type"]);
JSON.stringify(cat);
JSON.stringify(cat, /type/);

संदर्भ

Q137. Which document method is not used to get a reference to a DOM node?

document.getNode();
document.getElementsByClassName();
document.querySelectorAll();
document.querySelector();

संदर्भ

प्रश्न138. In JavaScript, all objects inherit a built-in property from a ****___.

node
instance variable
prototype
accessor

संदर्भ

Q139. Which of the following are not server-side Javascript objects?

तारीख
FileUpload
समारोह
All of the above

संदर्भ

प्रश्न140. What will be the output of the following code snippet?

const obj1 = { first: 20, second: 30, first: 50 };
console.log(obj1);

पहला: 30 , दूसरा: 50
पहला: 50 , दूसरा: 30
पहला: 30 , दूसरा: 20
इनमे से कोई भी नहीं

Q141. Which object in Javascript doesn’t have a prototype?

Base Object
All objects have prototype
None of the objects have prototype
इनमे से कोई भी नहीं

संदर्भ

Q142. What does … operator do in JS?

Used to spread iterables to individual elements
Describe datatype of undefined
No such operator exists
इनमे से कोई भी नहीं

Q143. How to stop an interval timer in Javascript?

clearInterval
clearTimer
intervalOver
इनमे से कोई भी नहीं

संदर्भ

Q144. What will be the output of the following code snippet?

print(typeof NaN);

Object
Number
String
इनमे से कोई भी नहीं

Q145. What will be the output of the following code snippet?

<script type="text/javascript">a = 5 + "9"; document.write(a);</script>

Compilation Error
14
Runtime Error
59

Q146. Which of the following methods can be used to display data in some form using Javascript?

document.write()
console.log()
window.alert()
all of the above

Q147. What value is assigned to total after this code executes?

function sum(num1, num2 = 2, num3 = 3) {
  return num1 + num2 + num3;
}
let values = [1, 5];
let total = sum(4, ...values);

संदर्भ: Rest parameters

Q148. Which statement is applicable to the defer attribute of the HTML <लिखी हुई कहानी> उपनाम?

defer allows the browser to continue processing the page while the script loads in the background.
defer causes the script to be loaded from the backup content delivery network (CDN).
defer blocks the browser from processing HTML below the tag until the script is completely loaded.
defer lazy loads the script, causing it to download only when it is called by another script on the page.

संदर्भ: defer html script attribute

Q149. Which method of a class is called to initialize an object of that class?

init()
बनाएं()
नया()
constructor()

संदर्भ: constructor method

Q150. Which expression evaluates to true?

Boolean(NaN)
Boolean(0)
Boolean(“असत्य”)
Boolean(“”)

संदर्भ: Boolean object

Q151. How would you check if the word “pot” is in the word “potato”?

“pot”.indexOf(“potato”) !== -1
“potato”.includes(“Pot”)
“potato”.includes(“pot”)
“potato”.रोकना(“pot”);

संदर्भ: String.prototype.includes()

Q152. Which collection object allows a unique value to be inserted only once?

नक्शा
सरणी
तय करना
Object

संदर्भ: developer.mozilla Set

Q153. How would you change the color of this header to pink?

<h2 id="cleverest">girls</h2>

document.getElementByName(“cleverest”).style.color = “गुलाबी”;
document.getElementsByTagName(“एच 2”).style.color = “गुलाबी”;
document.getElementByName(“एच 2”).style.color = “गुलाबी”;
document.getElementById(“cleverest”).style.color = “गुलाबी”;

संदर्भ: W3Schools HTML DOM Style color Property

Q154. Which line is missing from this code if you expect the code to evaluate to true?

var compare = function (test1, test2) {
  // Missing line
};

compare(1078, '1078'); // yields true

test1==test2;
return test1===test2;
return test1==test2;
return test1!=test2;

संदर्भ: MDN Equality Docs

Q155. What is the output of this code?

if (true) {
  var first = 'You';
}

function fScope() {
  var second = 'got this!';
}
fScope();
console.log(first);
console.log(second);

आप
undefined
आप
ReferenceError
undefined
undefined
आप
got this!

संदर्भ: W3schools JS Scoping

Q156. What is the output for the code given below?

console.log('hello' + 'world');

helloworld!
helloworld !
hello world!
hello world !

Q157. What is the output of this code?

console.log(10 + 10);

Q158. Events related to the browser window can be handled by?

Onclicks
खिड़की
querySelector
इनमे से कोई भी नहीं

संदर्भ: GeeksForGeeks

Q159. How do you define a function in JavaScript?

function myFunction() {}
def myFunction() {}
var myFunction = () लाभ कमाने के लिए मुझे इस वस्तु का कितना हिस्सा बेचने की आवश्यकता है> {}
func myFunction() {}

संदर्भ

Q160. Your code is producing the error: TypeError: Cannot read property ‘reduce’ of undefined. यह जानने के लिए कि क्या आपने प्रश्न का सही उत्तर दिया है?

You are calling a method named reduce on an object that’s declared but has no value.
You are calling a method named reduce on an object that does not exist.
You are calling a method named reduce on an empty array.
You are calling a method named reduce on an object that has a null value.

Q161. Which of the following methods can be used to display data in some form using Javascript?

document.write()
console.log()
window.alert()
all of the above

Q162. Which document method is not used to get a reference to a DOM node?

document.getNode();
document.getElementsByClassName();
document.querySelectorAll();
document.querySelector();

Q163. Which of these is a valid variable name?

5thItem
firstName
grand total
समारोह

Q164. What function is used in JavaScript to schedule a function to run after a specified number of milliseconds?

setTimeout()
setInterval()
delay()
रुको()

संदर्भ

Q165. Which of the following is a server-side Java Script object?

समारोह
फ़ाइल
FileUpload
तारीख

संदर्भ

Q166. Which statement best describes the var keyword’s scope in JavaScript?

Block scope
Function scope
Global scope
Instance scope

Q167. What will be logged to the console?

const foo = () => console.log('First');
const bar = () => setTimeout(() => console.log('Second'), 0);
foo();
bar();
console.log('Third');

दूसरा, प्रथम, तीसरा
प्रथम, तीसरा, दूसरा
प्रथम, दूसरा, तीसरा
तीसरा, प्रथम, दूसरा

Q168. What will be the output of running this code?

function scream(words) {
  return words.toUpperCase() + '!!!';
}

scream('yay');

YAY!!!
ReferenceError
Undefined
TypeError

लेखक

हेलेन बस्सी

नमस्ते, I'm Helena, एक ब्लॉग लेखक जिसे शिक्षा क्षेत्र में ज्ञानवर्धक सामग्री पोस्ट करने का शौक है. मेरा मानना है कि शिक्षा व्यक्तिगत और सामाजिक विकास की कुंजी है, और मैं अपने ज्ञान और अनुभव को सभी उम्र और पृष्ठभूमि के शिक्षार्थियों के साथ साझा करना चाहता हूं. मेरे ब्लॉग पर, आपको सीखने की रणनीतियों जैसे विषयों पर लेख मिलेंगे, ऑनलाइन शिक्षा, व्यवसायिक नीति, और अधिक. मैं अपने पाठकों की प्रतिक्रिया और सुझावों का भी स्वागत करता हूं, इसलिए बेझिझक एक टिप्पणी छोड़ें या किसी भी समय मुझसे संपर्क करें. मुझे आशा है कि आपको मेरा ब्लॉग पढ़ने में आनंद आएगा और यह उपयोगी और प्रेरणादायक लगेगा.
सभी पोस्ट देखें

अभी पंजीकरण करें

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