chunk/src/chunk.js

Chunk converts arrays like `[1,2,3,4,5]` into arrays of arrays like `[[1,2], [3,4], [5]]`.

"use strict";

(function () {
  function chunk(collection, size) {
    var result = [];

    // default size to two item
    size = parseInt(size) || 2;

    // add each chunk to the result
    for (var x = 0; x < Math.ceil(collection.length / size); x++) {
      var start = x * size;
      var end = start + size;

      result.push(collection.slice(start, end));
    }

    return result;
  }

  // export in node or browser
  if (typeof exports !== "undefined") {
    if (typeof module !== "undefined" && module.exports) {
      exports = module.exports = chunk;
    }
    exports.chunk = chunk;
  } else {
    this.chunk = chunk;
  }
}.call(this));