lastIndexOfOrElse

function String.lastIndexOfOrElse<T>(
    target: string,
    source: string,
    orElse: (target: string) => T,
): number | T

Returns the index of the last occurrence of source string in target string, or the result of calling orElse function with target if not found.

Example

data-first

import { String } from "@monstermann/string";

String.lastIndexOfOrElse("hello world hello", "hello", () => -1); // 12
String.lastIndexOfOrElse("hello world", "foo", (str) => str.length); // 11

data-last

import { String } from "@monstermann/string";

pipe(
    "hello world hello",
    String.lastIndexOfOrElse("hello", () => -1),
); // 12

pipe(
    "hello world",
    String.lastIndexOfOrElse("foo", (str) => str.length),
); // 11