JavaScript String includes()

Check if a string includes "world":

let text = "Hello world, welcome to the universe.";
let result = text.includes("world");

More examples below.

Description

The includes() method returns true if a string contains a specified string.

Otherwise it returns false.

The includes() method is case sensitive.

string.includes(searchvalue, start)

Parameter	Description
searchvalue	Required. The string to search for.
start	Optional. The position to start from. Default value is 0.

Type	Description
A boolean.	`true` if the string contains the value, otherwise `false`.

Start at position 12:

let text = "Hello world, welcome to the universe.";
let result = text.includes("world", 12);

includes() is an ECMAScript6 (ES6) feature.

ES6 (JavaScript 2015) is supported in all modern browsers since June 2017:


Chrome 51	Edge 15	Firefox 54	Safari 10	Opera 38
May 2016	Apr 2017	Jun 2017	Sep 2016	Jun 2016

includes() is not supported in Internet Explorer.