1function splitArrayIntoChunksOfLen(arr, len) {
2 var chunks = [], i = 0, n = arr.length;
3 while (i < n) {
4 chunks.push(arr.slice(i, i += len));
5 }
6 return chunks;
7}
8var alphabet=['a','b','c','d','e','f'];
9var alphabetPairs=splitArrayIntoChunksOfLen(alphabet,2); //split into chunks of two