Bump to v4.0.0.

propertyOf.js

@@ -0,0 +1,33 @@
+define(['./internal/baseGet'], function(baseGet) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * The opposite of `_.property`; this method creates a function that returns
+   * the value at a given path of `object`.
+   *
+   * @static
+   * @memberOf _
+   * @category Util
+   * @param {Object} object The object to query.
+   * @returns {Function} Returns the new function.
+   * @example
+   *
+   * var array = [0, 1, 2],
+   *     object = { 'a': array, 'b': array, 'c': array };
+   *
+   * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
+   * // => [2, 0]
+   *
+   * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
+   * // => [2, 0]
+   */
+  function propertyOf(object) {
+    return function(path) {
+      return object == null ? undefined : baseGet(object, path);
+    };
+  }
+
+  return propertyOf;
+});