Chunk Array - ES6

chunk.js

/**
 * Non-destructive chunk method for arrays
 */
export const chunk = (array, chunk) => {
  var i, j, temparray = [];
  for (i = 0, j = array.length; i < j; i += chunk) {
    temparray.push(array.slice(i, i + chunk));
    // do whatever
  }
  return temparray;
}

chunk.test.js

import { expect } from 'chai';

it('can chunk an array', () => {
  const original = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  const expected = [ 
          [1, 2],
          [3, 4],
          [5, 6],
          [7, 8],
          [9, 10]
  ];
  expect(chunk(original, 2)).to.eql(expected);
  })
})