Bump to v3.0.0.

function/negate.js

@@ -0,0 +1,34 @@
+var isFunction = require('../lang/isFunction');
+
+/** Used as the `TypeError` message for "Functions" methods. */
+var FUNC_ERROR_TEXT = 'Expected a function';
+
+/**
+ * Creates a function that negates the result of the predicate `func`. The
+ * `func` predicate is invoked with the `this` binding and arguments of the
+ * created function.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} predicate The predicate to negate.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * function isEven(n) {
+ *   return n % 2 == 0;
+ * }
+ *
+ * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
+ * // => [1, 3, 5]
+ */
+function negate(predicate) {
+  if (!isFunction(predicate)) {
+    throw new TypeError(FUNC_ERROR_TEXT);
+  }
+  return function() {
+    return !predicate.apply(this, arguments);
+  };
+}
+
+module.exports = negate;