Chunk array by element or split array like a string

chunkArrayByElement.js

/**
 * chunkArrayByElement - Chunk array by element or split array like a string
 *
 * @param  {Array} arr array to chunk
 * @param  {Any} c   element to chunk by
 * @return {Array}     array containing chunk arrays
 */
// https://stackoverflow.com/questions/46468754/chunk-array-by-element
function chunk(arr, el) {
	if (arr.length === 0) {
  	return arr
  }

  return arr.reduce((prev, curr, index) => {
    if (curr === el) {
			if (index === 0 || index === arr.length - 1) {
        return prev
      }
    
      if (prev[prev.length - 1].length !== 0) {
        prev.push([]);
      }
    } else {
      prev[prev.length - 1].push(curr);
    }
    return prev;
  }, [[]]);
}