Array.prototype.findLast() - JavaScript | MDN

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Find the last prime number in an array

The following example returns the last element in the array that is a prime number, or undefined if there is no prime number.

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Array.prototype.find()

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Array.prototype.findLastIndex()

Array.prototype.includes()

Array.prototype.filter()

Array.prototype.every()

Array.prototype.some()

TypedArray.prototype.findLast()

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This page was last modified on Sep 2, 2026 by MDN contributors.

[Symbol.iterator]()

[Symbol.unscopables]

[Symbol.hasInstance]()

__defineGetter__()