JavaScript Strings

JavaScript Strings & String Methods is a core JavaScript concept covering master JavaScript strings, learn how to extract substrings, replace content, This topic is essential for academic learning, board exam preparation, and developing optimized real-world code.

JavaScript strings are for storing and manipulating text. They are written inside quotes (single or double).

Basic Usage

let carName1 = "Volvo XC60";  // Double quotes
let carName2 = 'Volvo XC60';  // Single quotes

String Length

The length property returns the number of characters in a string.

let text = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
let length = text.length; // 26

String Methods

JavaScript has many built-in methods to work with strings (remember: strings are Immutable).

Method	Description
slice(start, end)	Extracts a part of a string.
substring(start, end)	Similar to slice.
replace(old, new)	Replaces a specified value with another.
toUpperCase()	Converts to upper case.
toLowerCase()	Converts to lower case.
trim()	Removes whitespace from both sides.
charAt(index)	Returns the character at a specific index.
includes(str)	Returns true if the string contains str.

let text = "Please visit Microsoft!";
let newText = text.replace("Microsoft", "VishnuDigital");

Template Literals (ES6)

Template Literals use back-ticks (`) instead of quotes. They are the modern standard for handling complex strings.

1. Multiline Strings

let text = `This is a
multiline
string.`;

2. Interpolation (Variables in Strings)

let firstName = "John";
let lastName = "Doe";
let text = `Welcome ${firstName}, ${lastName}!`;

Backslash Escaping

If you need to use a quote inside a string of the same type, use the backslash \ escape character: let text = "We are the so-called \"Vikings\" from the north.";

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