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string.includes()

Test if a String includes a provided substring.

Signature

includes(pattern: String) => Boolean

Description

Tests if the calling String contains a provided substring.

Parameters

Parameter Type Required Description

pattern

String

true

Substring to search for in this String.

Return value

Type Description

Boolean

If true, the calling String contains the provided substring. Otherwise, false.

Examples

  1. Test if the calling string includes the String 200:

    "HTTP/1.1 200 OK".includes("200")
    true

  2. Test if the calling string includes the String 400:

    "HTTP/1.1 200 OK".includes("400")
    false

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