80 interview questions for developers (2024)

Hard

7 votes1801 runs1 comment

Which of the following equality(s) are true? 0 == '', 'f' + 1 == 'f1'

Front-end developer

javascript

equality

Jean-marie Cléryat Jan 4, 2022

Medium

6 votes1834 runs0 comment

What can we say about the following code?

Front-end developer

javascript

variables

Jean-marie Cléryat Jan 4, 2022

Hard

6 votes1777 runs2 comments

Write a Javascript code that prints the indexes of an array.

Front-end developer

array

for loop

Jean-marie Cléryat Nov 8, 2023

Hard

5 votes210 runs1 comment

How to overwrite a property in an object in Javascript

Front-end developer

objects

duplicates

Vincent Cotroat Sep 19, 2022

Hard

4 votes1873 runs0 comment

What will this code display?

Front-end developer

javascript

function

identity

Jean-marie Cléryat Jan 4, 2022

Medium

4 votes1856 runs1 comment

Write a Javascript code that displays the contents of the table : Peter, Paul, Jacques, and the length of the table.

Front-end developer

arrays

console.log

push

Jean-marie Cléryat Jan 4, 2022

Easy

4 votes1833 runs0 comment

Which of the following is the most optimized method for creating a literal object?

Front-end developer

javascript

objects

Jean-marie Cléryat Jan 4, 2022

Hard

4 votes1793 runs0 comment

Invert a string in Javascript

Front-end developer

arrays

strings

Jean-marie Cléryat Jan 4, 2022

Hard

3 votes1850 runs1 comment

What is the value of `obj.hello` after executing these few lines of code?

Front-end developer

objects

arrays

strings

Jean-marie Cléryat Oct 20, 2023

Medium

3 votes1843 runs0 comment

How to make an AJAX call to an external domain that makes public data available.

Front-end developer

ajax

authentication

Jean-marie Cléryat Jan 4, 2022

Hard

3 votes1829 runs0 comment

Explain the difference between `proto` and `prototype` in Javascript

Front-end developer

prototype

constructor

Jean-marie Cléryat Jan 4, 2022

Hard

3 votes1818 runs1 comment

How to call a function inside a function in Javascript

Front-end developer

functions

objects

Jean-marie Cléryat Jan 4, 2022

Medium

3 votes254 runs1 comment

Print the value of the variable name and age in the function sayHi()

Front-end developer

functions

variables

Vincent Cotroat Sep 19, 2022

Medium

3 votes205 runs0 comment

Compare two numbers in Javascript

Front-end developer

equality

comparison

type

Vincent Cotroat Sep 19, 2022

Hard

2 votes1828 runs0 comment

Which of the following equality(s) returns`true`?

Front-end developer

javascript

NaN

Jean-marie Cléryat Jan 4, 2022

Medium

2 votes1822 runs0 comment

NodeJS is a port of the JavaScript language on a runtime, and can be executed on the server side.

Front-end developer

javascript

node.js

Jean-marie Cléryat Jan 4, 2022

Hard

2 votes1818 runs0 comment

Identify the reasons why this code will not work correctly:

Front-end developer

javascript

html

form

Jean-marie Cléryat Jan 4, 2022

Hard

2 votes1783 runs0 comment

Explain the 2 phases of event propagation in the DOM.

Front-end developer

event

event propagation

Jean-marie Cléryat Jan 4, 2022

Hard

2 votes1770 runs0 comment

Which of the following code will log the message 'baz'?

Front-end developer

javascript

function

prototype

Jean-marie Cléryat Jan 4, 2022

Expert

2 votes239 runs0 comment

Write a function that calculates the perimeter of a circle.

Front-end developer

functions

objects

Vincent Cotroat Sep 19, 2022

80 interview questionsfor developers (2024)

Test your developer skills before an interview with 80 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

Which of the following equality(s) are true? 0 == '', 'f' + 1 == 'f1'

What can we say about the following code?

Write a Javascript code that prints the indexes of an array.

How to overwrite a property in an object in Javascript

What will this code display?

Write a Javascript code that displays the contents of the table : Peter, Paul, Jacques, and the length of the table.

Which of the following is the most optimized method for creating a literal object?

Invert a string in Javascript

What is the value of `obj.hello` after executing these few lines of code?

How to make an AJAX call to an external domain that makes public data available.

Explain the difference between `proto` and `prototype` in Javascript

How to call a function inside a function in Javascript

Print the value of the variable name and age in the function sayHi()

Compare two numbers in Javascript

Which of the following equality(s) returns`true`?

NodeJS is a port of the JavaScript language on a runtime, and can be executed on the server side.

Identify the reasons why this code will not work correctly:

Explain the 2 phases of event propagation in the DOM.

Which of the following code will log the message 'baz'?

Write a function that calculates the perimeter of a circle.

80 interview questionsfor developers (2024)

Test your developer skills before an interview with 80 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

Which of the following equality(s) are true? 0 == '', 'f' + 1 == 'f1'

What can we say about the following code?

Write a Javascript code that prints the indexes of an array.

How to overwrite a property in an object in Javascript

What will this code display?

Write a Javascript code that displays the contents of the table : Peter, Paul, Jacques, and the length of the table.

Which of the following is the **most optimized** method for creating a literal object?

Invert a string in Javascript

What is the value of `obj.hello` after executing these few lines of code?

How to make an AJAX call to an external domain that makes public data available.

Explain the difference between `__proto__` and `prototype` in Javascript

How to call a function inside a function in Javascript

Print the value of the variable name and age in the function sayHi()

Compare two numbers in Javascript

Which of the following equality(s) returns`true`?

NodeJS is a port of the JavaScript language on a runtime, and can be executed on the server side.

Identify the reasons why this code will not work correctly:

Explain the 2 phases of event propagation in the DOM.

Which of the following code will log the message 'baz'?

Write a function that calculates the perimeter of a circle.

Which of the following is the most optimized method for creating a literal object?

Explain the difference between `proto` and `prototype` in Javascript