Function indexOf

MathBox/mathbox-bundle.js:39533–39542

* Gets the index at which the first occurrence of `value` is found using * strict equality for comparisons, i.e. `===`. If the array is already sorted * providing `true` for `fromIndex` will run a faster binary search. * * @static * @memberOf _ * @category Arrays *

(array, value, fromIndex)

     * // => 2
     */
    function indexOf(array, value, fromIndex) {
      if (typeof fromIndex == 'number') {
        var length = array ? array.length : 0;
        fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0);
      } else if (fromIndex) {
        var index = sortedIndex(array, value);
        return array[index] === value ? index : -1;
      }
      return baseIndexOf(array, value, fromIndex);
    }

    /**
     * Gets all but the last element or last `n` elements of an array. If a