added core.bind()

lib/core.js

@@ -101,6 +101,29 @@ var core = new (function () {
     return false;
   };
 
+  /*
+  binds a function to an object
+   */
+  this.bind = function(self, fn)
+  {
+    var curryArgs = arguments.length > 2 ? Array.prototype.slice.call(arguments, 2) : [];
+    if (typeof fn === 'function' && !(fn instanceof RegExp)) {
+      return curryArgs.length
+        ? function () {
+        return arguments.length
+          ? fn.apply(self, curryArgs.concat(slice.call(arguments, 0)))
+          : fn.apply(self, curryArgs);
+      }
+        : function () {
+        return arguments.length
+          ? fn.apply(self, arguments)
+          : fn.call(self);
+      };
+    } else {
+      // in IE, native methods are not functions so they cannot be bound (note: they don't need to be)
+      return fn;
+    }
+  }
 })();
 
 module.exports = core;

test/core.js

@@ -69,7 +69,29 @@ tests = {
 , 'isEmpty, zero (false)': function () {
     assert.ok(!core.isEmpty(0));
   }
+,
+  'bind': function () {
+    function bar() {}
 
+    function foo() {
+      assert.equal(this.name, 'bar');
+    }
+
+    var fooBoundToBar = core.bind(bar, foo);
+    fooBoundToBar();
+  }
+,
+  'bind, arguments': function () {
+    function bar() {}
+
+    function foo(arg) {
+      assert.equal(this.name, 'bar');
+      assert.equal(arg, 'cats');
+    }
+
+    var fooBoundToBarWithCats = core.bind(bar, foo, 'cats');
+    fooBoundToBarWithCats();
+  }
 };
 
 module.exports = tests;