findIndex

The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise, it returns -1, indicating that no element passed the test. 5

const numbers = [1, 3, 5, 7, 9];
numbers.findIndex((num) => num > 7);
// => 4
numbers.findIndex((num) => num > 9);
// => -1

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References

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global\_Objects/Array/findIndex

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Backlinks

• Array Analysis