JavaScript Strings

JavaScript Strings

A string in JavaScript is a sequence of characters use to represent text. Strings are one of the most commonly used data types because they allow us to display messages, store names, handle user input, and much more.

How to Create Strings in JavaScript

Strings can written inside:

Single quotes ' '
Double quotes " "
Backticks (template literals)

Example:

String Length

You can use the .length property to find how many characters a string has.

Accessing Characters

You can access characters using:

Bracket notation []
.charAt()

Common String Methods

JavaScript provides built-in methods to handle strings.

Method	Description	Example
`toUpperCase()`	Converts string to uppercase	`"hello".toUpperCase()` → `"HELLO"`
`toLowerCase()`	Converts string to lowercase	`"HELLO".toLowerCase()" →` “hello”
`trim()`	Removes extra whitespace	`" hi ".trim()` → `"hi"`
`slice(start,end)`	Extracts part of a string	`"JavaScript".slice(0,4)` → `"Java"`
`replace(a,b)`	Replaces text	`"I like JS".replace("JS","JavaScript")`
`split()`	Splits a string into array	`"a,b,c".split(",")` → `["a","b","c"]`

String Concatenation (Joining Strings)

You can combine strings using:

+
+=
Template literals

Template Literals (Modern Technique)

Template literals allow embedding variables using ${}.

Searching in Strings

Method	Purpose
`indexOf()`	Returns position of substring (or -1 if not found)
`includes()`	Returns true/false if substring exists

Escaping Characters

Some characters like quotes must be escaped with \.

Final Example

✔ Summary

Strings store textual data.
They can be created using ' ', " ", or backticks `.
JavaScript offers many useful methods to manipulate strings.
Template literals make string formatting easier.

JavaScript Strings