JavaScript String includes() method
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Definition and usage
If the string contains the specified string,includes() The method will return true.
Otherwise return false.
includes() The method is case-sensitive.
Instance
Example 1
Check if the string contains "world":
let text = "Hello world, welcome to the universe.";
let result = text.includes("world");
let text = "Hello World, welcome to the universe.";
let result = text.includes("world", 12);
Example 2
Starting from position 12:
let text = "Hello world, welcome to the universe.";
let result = text.includes("world", 12);
Syntax
string.includes(searchvalue, start)
Parameters
| Parameters | Description |
|---|---|
| searchvalue | Required. The string to be searched. |
| start | Optional. The starting position. The default value is 0. |
Return value
| Type | Description |
|---|---|
| Boolean value | If the string contains this value, then true, otherwise is false. |
Browser support
includes() Is ECMAScript6 (ES6) feature.
All modern browsers support ES6 (JavaScript 2015):
| Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|
| Chrome | Edge | Firefox | Safari | Opera |
| Supported | Supported | Supported | Supported | Supported |
Internet Explorer 11 (or earlier versions) is not supported includes().
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