JavaScript Interview Questions and Answers

0 votes

What's the output? function checkAge(data) { if (data === { age: 18 }) { console.log('You are an adult!'); }

asked Feb 26 in JavaScript by DavidAnderson

0 votes

What's the output? function getPersonInfo(one, two, three) { console.log(one); console.log(two);

asked Feb 26 in JavaScript by DavidAnderson

0 votes

What's the output? let number = 0; console.log(number++); console.log(++number); console.log(number);

asked Feb 26 in JavaScript by DavidAnderson

+1 vote

What's the output? function sum(a, b) { return a + b; } sum(1, '2');

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

All object have prototypes. A: true B: false

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

What are the three phases of event propagation?

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

What's the output? function Person(firstName, lastName) { this.firstName = firstName; this.lastName = lastName; }

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

What's the output? function Person(firstName, lastName) { this.firstName = firstName; this.lastName = lastName; }

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

What happens when we do this? function bark() { console.log('Woof!'); } bark.animal = 'dog';

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

What's the output? let greeting; greetign = {}; // Typo! console.log(greetign);

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

What's the output? class Chameleon { static colorChange(newColor) { this.newColor = newColor;

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

What's the output? let a = 3; let b = new Number(3); let c = 3; console.log(a == b); console.log(a === b);

asked Feb 24 in JavaScript by DavidAnderson

+1 vote

What's the output? let c = { greeting: 'Hey!' }; let d; d = c; c.greeting = 'Hello'; console.log(d.greeting);

asked Feb 24 in JavaScript by DavidAnderson

0 votes

Which one is true? const bird = { size: 'small', }; const mouse = { name: 'Mickey', small: true, };

asked Feb 24 in JavaScript by DavidAnderson

0 votes

What's the output? +true; !'Lydia'; A: 1 and false B: false and NaN C: false and false

asked Feb 24 in JavaScript by DavidAnderson

0 votes

What's the output? for (var i = 0; i < 3; i++) { setTimeout(() => console.log(i), 1); } for (let i = 0; i < 3; i++)

asked Feb 24 in JavaScript by DavidAnderson

0 votes

What's the output? function sayHi() { console.log(name); console.log(age); var name = 'Lydia'; let age = 21; }

asked Feb 24 in JavaScript by DavidAnderson

0 votes

What is Web Workers API in javascript?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

How to Clone a Map or Set in JavaScript?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

Explain about the JavaScript weakMap set() Method?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

What is use of reduce() method of Array in javascript?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

Z-Index will not work with static postioning?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

What is The "use strict" Directive in javascript?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

Explain about the Map in Javascript?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

Maps keep the order of key insertion true/false

asked Feb 20 in JavaScript by DavidAnderson

0 votes

Play method on video is an asyn operations?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

What is Await Function in javscript?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

What is Async Function in Javascript?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

What is JavaScript Hoisting?

asked Feb 20 in JavaScript by DavidAnderson

0 votes

what is the memory size of a weakmap object?

asked Feb 20 in JavaScript by DavidAnderson

Page:

« prev
1
2
3
4
5
6
7
8
9
...
40
next »

...