JavaScript interview questions for developers

JavaScript is the most widely used scripting language. Without basic knowledge of JavaScript it is extremely difficult to work with web technologies. Any front-end interview without JavaScript question is not standard. Following are some useful JavaScript interview questions:

  • What is scope in JavaScript?
  • What is hoisting in JavaScript?
  • What is closure in JavaScript?
  • What are the difference between apply, call and bind?
  • What is IIFE?
  • What is the type of NaN? How to check a variable is NaN?
  • How to calculate the length of an associative array in JavaScript
  • What is prototypal Inheritance? Write an example
  • Difference between function expression and function definition