I wanted to practice functional programming (fp) without using any library but using vanilla JS only. So I took a problem from project euler:

The sum of the squares of the first ten natural numbers is,

12 + 22 + … + 102 = 385 The square of the sum of the first ten natural numbers is,

(1 + 2 + … + 10)2 = 552 = 3025 Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 − 385 = 2640.

Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.

My solution in FP:

/*jshint esversion: 6*/ (function () {   'use strict';    const range = f => num => Array.from(new Array(num), f);   const quadRange = range((_, i) => (i + 1) * (i + 1));   const simpRange = range((_, i) => i + 1);   const sum = (acc, val) => acc + val;   const sumOfQuads = quadRange(100)     .reduce(sum);   const quadsOfSum = simpRange(100)     .reduce(sum) * simpRange(100)     .reduce(sum);   console.log("solution ", quadsOfSum - sumOfQuads); })(); 

Is there a better way to write it in FP (without any libraries and with vanilla JS only)?