The String Type in JavaScript

In JavaScript, the type String is a basic type that allows us to handle text and perform operations on it.

A String (or character string) is a sequence of Unicode characters that can include letters, numbers, symbols, and spaces.

In JavaScript, strings are immutable. This means that once created, they cannot be modified (however, we can create new strings from existing ones).

Definition of string

A String in JavaScript can be defined using single quotes, double quotes, or backticks.

For example, all these ways of creating a String are valid

// Using single quotes
const message1 = 'Hello, world!';

// Using double quotes
const message2 = "Hello, world!";

// Using backticks (template literals)
const message3 = `Hello, world!`;

Escape characters

If you need to include quotes within a string, you must escape them using the backslash (\).

const text = "She said: \"Hello!\"";

String manipulation

Concatenating Strings

In JavaScript, you can concatenate Strings using the + operator

const name = "Luis" + " and " + "Maria"; // "Luis and Maria"

Properties of the String Object

Although Strings in JavaScript are primitives, they can be used as objects through the String constructor. This provides access to several useful properties:

String.length

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

let text = 'JavaScript';
console.log(text.length); // 10

Methods to manipulate strings

JavaScript provides many methods to work with strings.