internal/baseInvoke.js

define(['./baseEach', './isLength'], function(baseEach, isLength) {

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

  /**
   * The base implementation of `_.invoke` which requires additional arguments
   * to be provided as an array of arguments rather than individually.
   *
   * @private
   * @param {Array|Object|string} collection The collection to iterate over.
   * @param {Function|string} methodName The name of the method to invoke or
   *  the function invoked per iteration.
   * @param {Array} [args] The arguments to invoke the method with.
   * @returns {Array} Returns the array of results.
   */
  function baseInvoke(collection, methodName, args) {
    var index = -1,
        isFunc = typeof methodName == 'function',
        length = collection ? collection.length : 0,
        result = isLength(length) ? Array(length) : [];

    baseEach(collection, function(value) {
      var func = isFunc ? methodName : (value != null && value[methodName]);
      result[++index] = func ? func.apply(value, args) : undefined;
    });
    return result;
  }

  return baseInvoke;
});