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JavaScript Interview questions

Top JavaScript Interview questions and their answers

How to declare strings in JavaScript?

In JavaScript, you can declare strings using the "string" data type. Here are some examples: // Declaration of strings let str1 = "Hello, world!"; // using double quotes let str2 = 'JavaScript is awesome'; // using single quotes let str3 = `The result is ${num1 + num2}`; // using backticks for template

How to declare numbers in JavaScript?

In JavaScript, you can declare numbers using the "number" data type. Here are some examples: // Declaration of numbers let num1 = 10; // integer number let num2 = 3.14; // floating-point number // Mathematical operations with numbers let sum = num1 + num2; // addition let diff = num1 - num2; // subtraction let product = num1 * num2;

What is JavaScript? And How to get started with JavaScript?

What is JavaScript? And How to get started with JavaScript?

JavaScript is a high-level, interpreted programming language that is used to create dynamic and interactive websites. It was first introduced in 1995 and has since become one of the most widely used programming languages in the world. JavaScript adds functionality to web pages, such as creating pop-up windows, validating input

What are the different data types in JavaScript?

JavaScript has several data types, including: Number: represents both integer and floating-point numbers. String: represents a sequence of characters enclosed in quotes. Boolean: represents a logical entity and can have only two values, either true or false. Null: represents a deliberate non-value or absence of any object value. Undefined: represents