ForEach, Filter, Map using reduce in TS

myJSFunctions.ts

function myForEach<T>(
  input: T[],
  callback: (element: T, index: number, array: T[]) => void
): void {
  return input.reduce((acc, curr, idx, arr) => {
    callback(curr, idx, arr)

    return undefined;
  }, undefined);
}

function myFilter<T>(
  input: T[],
  callback: (element: T, index: number, array: T[]) => boolean
): T[] {
  return input.reduce<T[]>((acc, curr, idx, arr) => callback(curr, idx, arr) ? [...acc, curr] : acc, []);
}

function myMap<T, K>(
  input: T[],
  callback: (element: T, index: number, array: T[]) => K
): K[] {
  return input.reduce<K[]>((acc, curr, idx, arr) => [...acc, callback(curr, idx, arr)], []);
}