function indexOf(array, value, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = fromIndex == null ? 0 : toInteger(fromIndex);
      if (index < 0) {
        index = nativeMax(length + index, 0);
      }
      return baseIndexOf(array, value, index);
    }
Gets the index at which the first occurrence of `value` is found in `array`
using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
for equality comparisons. If `fromIndex` is negative, it's used as the
offset from the end of `array`.

@static
@memberOf _
@since 0.1.0
@category Array
@param {Array} array The array to inspect.
@param {*} value The value to search for.
@param {number} [fromIndex=0] The index to search from.
@returns {number} Returns the index of the matched value, else `-1`.
@example

_.indexOf([1, 2, 1, 2], 2);
// => 1

// Search from the `fromIndex`.
_.indexOf([1, 2, 1, 2], 2, 2);
// => 3