50 JavaScript Interview Questions

50 JavaScript Interview Questions

➡ What are the different data types present in JavaScript?

➡ Explain Hoisting in JavaScript

➡ Difference between “ == “ and “ === “ operator

➡ Difference between var and let keyword JavaScript

➡ Explain Implicit Type Coercion in JavaScript

➡ Explain Higher-Order Functions in JavaScript

➡ Describe NaN property in JavaScript?

➡ Explain passed by value and passed by reference

➡ What is an Immediately Invoked Function in JavaScript?

➡ Define strict mode in JavaScript and its characteristics

➡ Is JavaScript a statically typed or a dynamically typed language?

➡ Explain “this” keyword

➡ What do you mean by Self Invoking Functions?

➡ Explain call(), apply() and, bind() methods

➡ What is the difference between exec () and test () methods in JavaScript?

➡ What is currying in JavaScript?

➡ What are some advantages of using External JavaScript?

➡ Explain Scope and Scope Chain in JavaScript

➡ Explain Closures in JavaScript

➡ Mention some advantages of javascript

➡ Why do we use the word “debugger” in JavaScript?

➡ What are object prototypes?

➡ What are callbacks?

➡ What are the types of errors in JavaScript?

➡ What is memoization?

➡ What is recursion in a programming language?

➡ What is the use of a constructor function in JavaScript?

➡ What is DOM?

➡ Which method is used to retrieve a character from a specific index?

➡ What do you mean by BOM?

➡ What is the distinction between client-side and server-side JavaScript?

➡ Define arrow functions?

➡ What do you mean by prototype design pattern?

➡ Differences between declaring variables using var, let, and const

➡ What are the rest parameter and spread operators?

➡ In JavaScript, how many different methods can you make an object?

➡ What is the use of promises in JavaScript?

➡ What are classes in JavaScript?

➡ What are generator functions?

➡ What is the role of deferred scripts in JavaScript?

➡ Why do we use callbacks?

➡ Explain WeakMap in JavaScript

➡ What is Object Destructuring?

➡ Difference between prototypal and classical inheritance

➡ What is a Temporal Dead Zone?

➡ Describe JavaScript Design Patterns?

➡ Is JavaScript a pass-by-reference or pass-by-value language?

➡ Difference between Async/Await and Generators usage to achieve the same functionality

➡ Define primitive data types in JavaScript?

➡ Explain WeakSet in JavaScript?

Source:
Ayush Thaku