Add bindKey

snippets/bindKey.md

@@ -0,0 +1,24 @@
+### bindKey
+
+Creates a function that invokes the method at a given key of an object, optionally adding any additional supplied parameters to the beginning of the arguments.
+
+Return a `function` that uses `Function.apply()` to bind `context[fn]` to `context`.
+Use `Array.concat()` to prepend any additional supplied parameters to the arguments.
+
+```js
+const bindKey = (context, fn, ...args) =>
+  function() {
+    return context[fn].apply(context, args.concat(...arguments));
+  };
+```
+
+```js
+const freddy = {
+  user: 'fred',
+  greet: function(greeting, punctuation) {
+    return greeting + ' ' + this.user + punctuation;
+  },
+};
+const freddyBound = bindKey(freddy, 'greet');
+console.log(freddyBound('hi', '!')); // 'hi fred!'
+```