updated README

map/README.md

@@ -1,17 +1,17 @@
-You might know about [map](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/map) method, let's implement your own `map` one and name it, say `_map`.
+You might know about [map](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/map) method, let's implement your own `map` one.
 
-`_map` should function like `map` does:
+`map` should function like `map` does:
 
 ```js
-require('./')() // <- this is the file you make;
+var map = require('./') // <- this is the file you make;
 
 var numbers = [1, 2, 3];
 
-var doubles = numbers._map(function(number) {
+var doubles = map(numbers, function(number) {
   return number * 2;
 });
 
-console.log(doubles); // [1, 4, 6]
+console.log(doubles); // [2, 4, 6]
 
 ```