composeArgsRight.js 1.24 KB
define([], function() {

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

  /**
   * This function is like `composeArgs` except that the arguments composition
   * is tailored for `_.partialRight`.
   *
   * @private
   * @param {Array|Object} args The provided arguments.
   * @param {Array} partials The arguments to append to those provided.
   * @param {Array} holders The `partials` placeholder indexes.
   * @returns {Array} Returns the new array of composed arguments.
   */
  function composeArgsRight(args, partials, holders) {
    var holdersIndex = -1,
        holdersLength = holders.length,
        argsIndex = -1,
        argsLength = nativeMax(args.length - holdersLength, 0),
        rightIndex = -1,
        rightLength = partials.length,
        result = Array(argsLength + rightLength);

    while (++argsIndex < argsLength) {
      result[argsIndex] = args[argsIndex];
    }
    var offset = argsIndex;
    while (++rightIndex < rightLength) {
      result[offset + rightIndex] = partials[rightIndex];
    }
    while (++holdersIndex < holdersLength) {
      result[offset + holders[holdersIndex]] = args[argsIndex++];
    }
    return result;
  }

  return composeArgsRight;
});