lastIndexOf

lastIndexOf(haystack, needle) → number · String

Find the position of the LAST occurrence of a value. Returns -1 if not found.

• haystack (required): string or array to search in

• needle (required): value to find

lastIndexOf("abcabc", "bc")              // 4 (last occurrence, not first at 1)
lastIndexOf(["A", "B", "A", "C"], "A")   // 2 (last A)
lastIndexOf("hello", "xyz")              // -1

Also: findIndex(array, predicate) — find by condition instead of value. findLastIndex(array, predicate) — last match by condition.