Function findIndex

Finds the index of the first element in the source array that satisfies the provided predicate function.

Returns -1 if no element satisfies the predicate.

Example

const findPositiveIndex = findIndex((x: number) => x > 0);
const a = findPositiveIndex([1, 2, 3]); // 0
const b = findPositiveIndex([-1, 0, -2]); // -1
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