Arguments_Shape_Adapters.js

"use strict";
// Quick Arguments Shape Adapters

function unary(fn) {
  return function one(arg) {
    return fn(arg);
  };
}

function binary(fn) {
  return function two(arg1, arg2) {
    return fn(arg1, arg2);
  };
}

function reverseArgs(fn) {
  return function rev(...args) {
    return fn(...args.reverse());
  };
}

function f(...args) {
  return args;
}
var unary_wrap = unary(f);
var binary_wrap = binary(f);
var reverse_wrap = reverseArgs(f);

console.log("unary:", unary_wrap(1, 2, 3, 4)); //[1]
console.log("binary:", binary_wrap(1, 2, 3, 4)); //[1,2]
console.log("reverse args:", reverse_wrap(1, 2, 3, 4)); //[4,3,2,1]