lastIndexOfOrThrow

lastIndexOfOrThrow(target, source)

Returns the index of the last occurrence of source string in target string, or throws an error if not found.

data-first

lastIndexOfOrThrow("hello world hello", "hello"); // 12
lastIndexOfOrThrow("hello world", "foo"); // throws FnError

data-last

pipe("hello world hello", lastIndexOfOrThrow("hello")); // 12
pipe("hello world", lastIndexOfOrThrow("foo")); // throws FnError