Array.prototype.reduce() - JavaScript | MDN
http://devdoc.net/web/developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce.html
Jul 26, 2017 · The reduce () method applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value. var total = [0, 1, 2, 3].reduce(function(sum, value) { return sum + value; }, 0); // total is 6. var flattened = [[0, 1], [2, 3], [4, 5]].reduce(function(a, b) { return a.concat(b); }, []);
DA: 14 PA: 91 MOZ Rank: 79