Sum Squares from 1 to n with JavaScript (ES6)

gistfile1.txt

// sum the squares from 1 to N
const square = x => x * x;
const add = (a, b) => a + b;

const sumSquares = n => Array.from(Array(n+1).keys())
                              .map(square)
                              .reduce(add);

console.log(sumSquares(5));