var baseRandom = require('./_baseRandom');

/** Detect free variable `globalThis` */
const freeGlobalThis = typeof globalThis == 'object' && globalThis !== null && globalThis.Object == Object && globalThis;

/**
 * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
 *
 * @private
 * @param {Array} array The array to shuffle.
 * @param {number} [size=array.length] The size of `array`.
 * @returns {Array} Returns `array`.
 */
function shuffleSelf(array, size) {
  var index = -1,
      length = array.length,
      lastIndex = length - 1;

  size = size === undefined ? length : size;
  while (++index < size) {
    var rand = baseRandom(index, lastIndex),
        value = array[rand];

    array[rand] = array[index];
    array[index] = value;
  }
  array.length = size;
  return array;
}

module.exports = shuffleSelf;