use let instead of var in for loop.

neighborhood999 · neighborhood999 · commit 6be57b6ce9f1 · 2016-06-19T20:20:09.000+08:00
diff --git a/readme.md b/readme.md
@@ -66,7 +66,7 @@ A function which takes a function as an argument and/or returns a function.
 ```js
 const filter = (pred, xs) => {
     const result = [];
-    for (var idx = 0; idx < xs.length; idx++) {
+    for (let idx = 0; idx < xs.length; idx++) {
         if (pred(xs[idx])) {
             result.push(xs[idx]);
         }

Original file line number	Diff line number	Diff line change
`@@ -66,7 +66,7 @@ A function which takes a function as an argument and/or returns a function.`
`66`	`66`	```js
`67`	`67`	`const filter = (pred, xs) => {`
`68`	`68`	`const result = [];`
`69`		`- for (var idx = 0; idx < xs.length; idx++) {`
	`69`	`+ for (let idx = 0; idx < xs.length; idx++) {`
`70`	`70`	`if (pred(xs[idx])) {`
`71`	`71`	`result.push(xs[idx]);`
`72`	`72`	`}`