--- /dev/null
+// optional / simple context binding
+var aFunction = require('./_a-function');
+module.exports = function(fn, that, length){
+ aFunction(fn);
+ if(that === undefined)return fn;
+ switch(length){
+ case 1: return function(a){
+ return fn.call(that, a);
+ };
+ case 2: return function(a, b){
+ return fn.call(that, a, b);
+ };
+ case 3: return function(a, b, c){
+ return fn.call(that, a, b, c);
+ };
+ }
+ return function(/* ...args */){
+ return fn.apply(that, arguments);
+ };
+};
\ No newline at end of file