var baseIndexOf = require('./internal/baseIndexOf'),
    toInteger = require('./toInteger');

/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeMax = Math.max;

/**
 * Gets the index at which the first occurrence of `value` is found in `array`
 * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
 * for equality comparisons. If `fromIndex` is negative, it's used as the offset
 * from the end of `array`. If `array` is sorted providing `true` for `fromIndex`
 * performs a faster binary search.
 *
 * @static
 * @memberOf _
 * @category Array
 * @param {Array} array The array to search.
 * @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
 *
 * // using `fromIndex`
 * _.indexOf([1, 2, 1, 2], 2, 2);
 * // => 3
 */
function indexOf(array, value, fromIndex) {
  var length = array ? array.length : 0;
  if (!length) {
    return -1;
  }
  fromIndex = toInteger(fromIndex);
  if (fromIndex < 0) {
    fromIndex = nativeMax(length + fromIndex, 0);
  }
  return baseIndexOf(array, value, fromIndex);
}

module.exports = indexOf;
