mapreducefun.js

const test = [1,2,3,4];
const processors = [
	x => x * 2,
	x => x * 3,
	x => x * 4,
	x => x * 5
];

const zipFn = test.map((e, idx) => processors[idx](e));

const { res } = test.reduce(({ processors, res }, e, idx) => ({
	processors,
	res: res + processors[idx](e)
}),
{
	processors,
	res: 0
});

console.log(zip) // [ 2, 6, 12, 20 ]
console.log(res) // 40