split-into-groups.js

/**
 * Small helper to split an array into groups of various size
 *
 * Usage: 
 * group([1, 2, 3, 4, 5], 2) # -> [[1, 2], [3, 4], [5]]
 * group([1, 2, 3, 4], 5) # -> [[1, 2, 3, 4]]
 **/
let group = (arr, numPerGroup) => {
  if (arr.length <= 0) return [];
  let groups = []; 
  let numgroups = (arr.length/(arr.length/numPerGroup)); 
  while(arr.length) {
    groups.push(arr.splice(0, numPerGroup))
  }; 
  return groups; 
}