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qwen/nodejs/node_modules/lodash/negate.js

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+/** Error message constants. */
+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 _
+ * @since 3.0.0
+ * @category Function
+ * @param {Function} predicate The predicate to negate.
+ * @returns {Function} Returns the new negated 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 (typeof predicate != 'function') {
+    throw new TypeError(FUNC_ERROR_TEXT);
+  }
+  return function() {
+    var args = arguments;
+    switch (args.length) {
+      case 0: return !predicate.call(this);
+      case 1: return !predicate.call(this, args[0]);
+      case 2: return !predicate.call(this, args[0], args[1]);
+      case 3: return !predicate.call(this, args[0], args[1], args[2]);
+    }
+    return !predicate.apply(this, args);
+  };
+}
+
+module.exports = negate;