Bump to v4.0.0.

constant.js

@@ -0,0 +1,26 @@
+define([], function() {
+
+  /**
+   * Creates a function that returns `value`.
+   *
+   * @static
+   * @memberOf _
+   * @category Util
+   * @param {*} value The value to return from the new function.
+   * @returns {Function} Returns the new function.
+   * @example
+   *
+   * var object = { 'user': 'fred' };
+   * var getter = _.constant(object);
+   *
+   * getter() === object;
+   * // => true
+   */
+  function constant(value) {
+    return function() {
+      return value;
+    };
+  }
+
+  return constant;
+});