/**
 * simple utils around functions, e.g. pipeline helpers
 *
 * @module
 */

export const identity = <T>(value: T) => value;
export const iife = <T>(fn: () => T) => fn();
export const ignore = () => {};
export const failWith = (e: unknown) => {
  throw e;
};
export const memoize = <Arg, T>(
  getKey: (value: Arg) => string,
  fn: (value: Arg) => T,
) => {
  const cache = new Map<string, T>();
  return (arg: Arg) => {
    const key = getKey(arg);
    if (cache.has(key)) {
      return cache.get(key)!;
    }
    const computed = fn(arg);
    cache.set(key, computed);
    return computed;
  };
};