Array.prototype.includes

Determines whether an array includes a certain element.

Syntax

includes(element, startIndex?)

Parameters

• element

  The element to search for.

• startIndex optional

  The index in the array at which to begin searching.

Return value

Returns true if the array contains the element, false if it doesn’t.

Examples

[1, 2, 3].includes(1)

true

[1, 2, 3].includes(42)

false

["coffee", "tea", "juice"].includes("tea")

true

["coffee", "tea", "juice"].includes("milk")

false