findIndexOrThrow

findIndexOrThrow(target, predicate)

Returns the index of the first element in target that satisfies the provided predicate function. If no element satisfies the predicate, throws an error.

data-first

findIndexOrThrow([1, 2, 3, 4], (x) => x > 2); // 2
findIndexOrThrow([1, 2, 3, 4], (x) => x > 5); // throws FnError

data-last

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

pipe(
    [1, 2, 3, 4],
    findIndexOrThrow((x) => x > 5),
); // throws FnError