Function initial

MathBox/mathbox-bundle.js:39594–39608

* Gets all but the last element or last `n` elements of an array. If a * callback is provided elements at the end of the array are excluded from * the result as long as the callback returns truey. The callback is bound * to `thisArg` and invoked with three arguments; (value, index, ar

(array, callback, thisArg)

     * // => ['barney', 'fred']
     */
    function initial(array, callback, thisArg) {
      var n = 0,
          length = array ? array.length : 0;

      if (typeof callback != 'number' && callback != null) {
        var index = length;
        callback = lodash.createCallback(callback, thisArg, 3);
        while (index-- && callback(array[index], index, array)) {
          n++;
        }
      } else {
        n = (callback == null || thisArg) ? 1 : callback || n;
      }
      return slice(array, 0, nativeMin(nativeMax(0, length - n), length));
    }

    /**
     * Creates an array of unique values present in all provided arrays using