String.includes() — run online

String

String.includes()

Returns true if a string contains a given substring, false otherwise

→ booleanPHP: str_contains()ES7+

stringstring

Source string

searchStringstring

Substring to search for

positionnumberoptional

Position to start searching from

(string).includes(searchString, position)

RESULT

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Parameter Reference

Parameter	Type	Status	Description
string	string	required	Source string
searchString	string	required	Substring to search for
position	number	optional	Position to start searching from

About

includes() returns true if the string contains the specified substring, false otherwise. A more readable alternative to indexOf() !== -1. Case-sensitive. Related: startsWith() checks the beginning, endsWith() checks the end.

Browser Support

Introduced in ES7/ES2016. PHP got str_contains() only in PHP 8.0 (2020). Before ES2016, indexOf() !== -1 was the standard.

Tips & Gotchas

includes() is case-sensitive — for case-insensitive: str.toLowerCase().includes(sub.toLowerCase())
use startsWith() and endsWith() for beginning/end — semantically clearer
includes() does not accept a RegExp — use test() for patterns.