equalArrays.js 1.94 KB
define(['./arraySome'], function(arraySome) {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /**
   * A specialized version of `baseIsEqualDeep` for arrays with support for
   * partial deep comparisons.
   *
   * @private
   * @param {Array} array The array to compare.
   * @param {Array} other The other array to compare.
   * @param {Function} equalFunc The function to determine equivalents of values.
   * @param {Function} [customizer] The function to customize comparing arrays.
   * @param {boolean} [isLoose] Specify performing partial comparisons.
   * @param {Array} [stackA] Tracks traversed `value` objects.
   * @param {Array} [stackB] Tracks traversed `other` objects.
   * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
   */
  function equalArrays(array, other, equalFunc, customizer, isLoose, stackA, stackB) {
    var index = -1,
        arrLength = array.length,
        othLength = other.length;

    if (arrLength != othLength && !(isLoose && othLength > arrLength)) {
      return false;
    }
    // Ignore non-index properties.
    while (++index < arrLength) {
      var arrValue = array[index],
          othValue = other[index],
          result = customizer ? customizer(isLoose ? othValue : arrValue, isLoose ? arrValue : othValue, index) : undefined;

      if (result !== undefined) {
        if (result) {
          continue;
        }
        return false;
      }
      // Recursively compare arrays (susceptible to call stack limits).
      if (isLoose) {
        if (!arraySome(other, function(othValue) {
              return arrValue === othValue || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
            })) {
          return false;
        }
      } else if (!(arrValue === othValue || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB))) {
        return false;
      }
    }
    return true;
  }

  return equalArrays;
});