Advent of code day 2 answer - adventofcode.com

day2.js

function calculateWrappingPaperNeeds(input) {
  return input.split('\n')
  .reduce((sqFt, eq) => {
  	var d = eq.split('x');
  	var l = d[0], w = d[1], h = d[2];
    sqFt += 2*l*w + 2*w*h + 2*h*l;
    sqFt += Math.min(l*w, w*h, h*l); // little extra
    return sqFt;
  }, 0);
}