LinkedIn JavaScript Skill Assessment Answers 2021(💯Correct)

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Here, you will get the LinkedIn JavaScript Skill Assessment Answers in bold color which are given below.

These are the answers to LinkedIn JavaScript Skill Assessment free certification course. These answers have been updated recently and are 100% correct. The final exam is on Monday, April. All answers are 100%.

LinkedIn JavaScript Assessment Answers

Q1. Review the code below. 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;

Q2. Which operator returns true if the two compared values are not equal?

  • <>
  • ~
  • ==!
  • !==

Q3. How would you use this function to find out how much tax should be paid on $50?
(Version 2, possibly an updated version)

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

  • addTax($50);
  • return addTax 50;
  • addTax(50);
  • addTax 50;

Q4. 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’

Q5. 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;

Q6. Which statement creates a new Person object called “student”?

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

Q7. How is a forEach statement different from a for statement?

  • Only a for statement uses a callback function.
  • A for statement is generic, but a forEach statement can be used only with an array.
  • 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.

Q8. When would the final statement in the code shown be logged to the console?
let modal = document.querySelector(‘#result’);
setTimeout(function(){
modal.classList.remove(‘hidden);
}, 10000);
console.log(‘Results shown’);

  • after 10 second
  • after results are received from the HTTP request
  • after 10000 seconds
  • immediately

Q9. You’ve written the code shown to log a set of consecutive values, but it instead results in the value 5, 5, 5, and 5 being logged to the console. Which revised version of the code would result in the value 1, 2, 3 and 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) }
  • while (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); }

Q10. 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.

Q11. When would ‘results shown’ be logged to the console?
(Version 2, possibly an updated version)

let modal = document.querySelector(‘#results’);
setTimeout(function () {
modal.classList.remove(‘hidden’);
}, 10000);

  • immediately
  • after results are received from the HTTP request
  • after 10 second
  • after 10,000 seconds

Q12. 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; };

Q13. 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

Q14. 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]+/
  • / : : /

Q15. 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]

Q16. What is the result of running this statement?
console.log(typeof(42));

  • ‘float’
  • ‘value’
  • ‘number’
  • ‘integer’

Q17. 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’)

Q18. Which property references the DOM object that dispatched an event?

  • self
  • object
  • target
  • source

Q19. Which method converts JSON data to a JavaScript object?

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

Q20. What would be the result in the console of running this code?
for (var i = 0; i < 5; i++) {
console.log(i);
}

  • 12345
  • 1234
  • 01234
  • 012345

Q21. 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.

Q22. 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()

Q23. 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

Q24. After the following code, what is the value of a.length?
var a = [‘dog’, ‘cat’, ‘hen’];
a[100] = ‘fox’;
console.log(a.length);

  • 101
  • 3
  • 4
  • 100

Q25. 0 && hi

  • ReferenceError
  • True
  • 0
  • false

Q26. 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.
  • Map.prototype.size returns the number of elements in a Map, whereas Object does not have a built-in method to return its size.

Q27. Which of the following operators can be used to do a short-circuit evaluation?

  • ++
  • ==
  • ||

Q28. 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

Q29. 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();

Q30. Which Variable-defining keyword allows its variable to be accessed (as undefined) before the line that defines it?

  • all of them
  • const
  • var
  • let

Q31. Which of the following is not a keyword in JavaScript?

  • this
  • catch
  • function
  • array

Q32. Which of the following values is not a Boolean false?

  • Boolean(0)
  • Boolean(“”)
  • Boolean(NaN)
  • Boolean(“false”)

Q33. Which variable is an implicit parameter for every function in JavaScript?

  • Arguments
  • args
  • argsArray
  • argumentsList

Q34. 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

Q35. 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.

Q36. For the following class, how do you get the value of 42 from an instance of X?
class X {
get Y() {
return 42;
}
}

  • x.get(‘Y’)
  • x.Y
  • x.Y()
  • x.get().Y

Q37. 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’;

Q38. 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.

Q39. What will this code print?
f2();

  • 2
  • 1
  • Nothing – this code will throw an error.
  • undefined

Q40. What does the following expression evaluate to?
[] == [];

  • True
  • undefined
  • []
  • False

Q41. What is the name of a function whose execution can be suspended and resumed at a later point?

  • Generator function
  • Arrow function
  • Async/ Await function
  • Promise function

Q42. 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.

Q43. Which choice is not a unary operator?

  • typeof
  • delete
  • instanceof
  • void

Q44. Your code is producing the error: TypeError: Cannot read property ‘reduce’ of undefined. What does that mean?

  • 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’s has a null value.

Q45. What type of scope does the end variable have in the code shown?
var start = 1;
if (start === 1) {
let end = 2;
}

  • conditional
  • block
  • global
  • function

Q46. How many prototype objects are in the chain for the following array?
let arr = [];

  • 3
  • 2
  • 0
  • 1

Q47. What will the value of y be in this code:
const x = 6 % 2;
const y = x ? ‘One’ : ‘Two’;

  • One
  • undefined
  • TRUE
  • Two

Q48. Which keyword is used to create an error?

  • throw
  • exception
  • catch
  • error

Q49. The following program has a problem. What is it?
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.

Q50. 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.

Q51. 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’)

Q52. 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

Q53. What value does this code return?
let answer = true;
if (answer === false) {
return 0;
} else {
return 10;
}

  • 10
  • true
  • false
  • 0

Q54. 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

Q55. What two values will this code print?
function printA() {
console.log(answer);
var answer = 1;
}
printA();
printA();

  • 1 then 1
  • 1 then undefined
  • undefined the undefined
  • undefined the 1

Q56. This program has a problem. What is it?
(Version 2, possibly an updated version)

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

Q57: Which collection object allows unique value to be inserted only once?

  • Object
  • Set
  • Array
  • Map
  • You cannot use a ternary operator in the right-hand side of an assignment.
  • You cannot define a variable without initializing it first.
  • The condition in the ternary statement is using the assignment operator.
  • The code is using the deprecated var keyword.

Q58. For the following class, how do you get the value of 42 from “X” ?
class X {
get Y() {
return 42;
}
}
var x = new X();

  • x.Y
  • x.Y()
  • x.get(‘Y’)
  • x.get().Y

Q59. Which choice is an incorrect way to define an arrow function that returns an empty object?

  • => ({})
  • => {}
  • => { return {};}
  • => (({}))

Q60. How does the forEach() method differ from a for statement?

  • 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 loops cannot.

Q61. Which expression evaluates to true?

  • [3] == [3]
  • 3 == ‘3’
  • 3 != ‘3’
  • 3 === ‘3’

Q62. What will be logged to the console?
‘use strict’;
function logThis() {
this.desc = ‘logger’;
console.log(this);
}
new logThis();

  • undefined
  • function
  • windows
  • {desc: “logger”}

Q63. 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) structure

Q64. Which method do you use to attach one DOM node to another?

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

Q65. Which of these is a valid variable name?

  • 5thItem
  • firstName
  • grand total
  • function

Q66. Which statement is used to skip iteration of the loop?

  • break
  • pass
  • skip
  • continue

Q67. Which method cancels event default behavior?

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

Q68. Which choice is valid example for an arrow function?

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

Q69. 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

Q70. What is the result of running the statement shown?
let a = 5;
console.log(++a);

  • 4
  • 10
  • 6
  • 5

Q71. 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

Q72. Which concept is defined as a template that can be used to generate different objects that share some shape and/or behavior?

  • class
  • generator function
  • map
  • proxy

Q73. Which method is called automatically when an object is initialized?

  • create()
  • new()
  • constructor()
  • init()
  • create()
  • new()
  • constructor()
  • init()

Q74. 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

Q75. 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’); })();

Q76. Which statement selects all img elements in the DOM tree?

  • Document.querySelector(‘img’)
  • Document.querySelectorAll(‘<img>’)
  • Document.querySelectorAll(‘img’)
  • Document.querySelector(‘<img>’)

Q77. What is the HTTP verb to request the contents of an existing resource?

  • DELETE
  • GET
  • PATCH
  • POST

Q78. 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,
);

Q79. 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);

Q80. Which event is fired on a text field within a form when a user tabs to it, or clicks or touches it?

  • focus
  • blur
  • hover
  • enter

Q81. What will be logged to the console?
var a = [‘dog’, ‘cat’, ‘hen’];
a[100] = ‘fox’;
console.log(a.length);

  • 4
  • 100
  • 101
  • 3

Q82. What is the result in the console of running this code?
function logThis() {
console.log(this);
}
logThis();

  • function
  • undefined
  • Function.prototype
  • window

Q83. Which class-based component is equivalent to this function component?

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

Q84. Which class-based lifecycle method would be called at the same time as this effect Hook?
useEffect(() => {
// do things
}, []);

  • componentWillUnmount
  • componentDidUpdate
  • render
  • componentDidMount

Q85. What is the output of this code?
var obj;
console.log(obj);

  • ReferenceError: obj is not defined
  • {}
  • undefined
  • null

Conclusion:

Quizzes can be used to generate more interest among the students who want to learn in a competitive situation. Two such quizzes that work well with students in the middle school year level include “The Hollow Square Quiz” and “The Hollow Circle Quiz.” The second quiz is called “The Student Created Quiz”, which can be used as part of the revision program. From our website the student of each group will be get quiz answers n that topic.

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