A simple functional compose implementation in javascript.

compose.js

export function compose(...funcs: Array<(...args: Array<any>) => any>) {
  if (funcs.length === 0) {
    return (arg: any) => arg;
  }

  if (funcs.length === 1) {
    return funcs[0];
  }

  const last = funcs[funcs.length - 1];
  return (...args: Array<any>) => {
    let result = last(...args);
    for (let index = funcs.length - 2; index >= 0; index--) {
      const fn = funcs[index];
      result = fn(result);
    }
    return result;
  };
}