findIndex

findIndex(array, predicate)

Returns the index of the first element in array that satisfies the provided predicate function, or -1 if no element is found.

data-first

findIndex([1, 2, 3, 4], (x) => x > 2); // 2

data-last

pipe(
    [1, 2, 3, 4],
    findIndex((x) => x > 2),
); // 2