init

node_modules/util-arity/arity.js

@@ -0,0 +1,29 @@
+var FUNCTIONS = {};
+
+/**
+ * Create a function wrapper that specifies the argument length.
+ *
+ * @param  {number}   arity
+ * @param  {Function} fn
+ * @return {Function}
+ */
+module.exports = function (arity, fn) {
+  if (!FUNCTIONS[arity]) {
+    var params = [];
+
+    if (typeof arity !== 'number') {
+      throw new TypeError('Expected arity to be a number, got ' + arity);
+    }
+
+    for (var i = 0; i < arity; i++) {
+      params.push('_' + i);
+    }
+
+    FUNCTIONS[arity] = new Function(
+      'fn',
+      'return function arity' + arity + ' (' + params.join(', ') + ') { return fn.apply(this, arguments); }'
+    );
+  }
+
+  return FUNCTIONS[arity](fn);
+};