update docs

docs/api/context.md

@@ -99,7 +99,7 @@ this.throw('something exploded');
   For example `this.throw('name required', 400)` is equivalent to:
 
 ```js
-var err = new Error('name required');
+const err = new Error('name required');
 err.status = 400;
 throw err;
 ```

docs/api/index.md

@@ -29,8 +29,8 @@ $ node my-koa-app.js
   The obligatory hello world application:
 
 ```js
-var koa = require('koa');
+const koa = require('koa');
-var app = new Koa();
+const app = new Koa();
 
 app.use(function *(){
   this.body = 'Hello World';
@@ -55,24 +55,24 @@ app.listen(3000);
   its upstream behaviour.
 
 ```js
-var koa = require('koa');
+const koa = require('koa');
-var app = new Koa();
+const app = new Koa();
 
 // x-response-time
 
 app.use(function *(next){
-  var start = new Date;
+  const start = new Date;
   yield next;
-  var ms = new Date - start;
+  const ms = new Date - start;
   this.set('X-Response-Time', ms + 'ms');
 });
 
 // logger
 
 app.use(function *(next){
-  var start = new Date;
+  const start = new Date;
   yield next;
-  var ms = new Date - start;
+  const ms = new Date - start;
   console.log('%s %s - %s', this.method, this.url, ms);
 });
 
@@ -105,17 +105,17 @@ app.listen(3000);
   `Server#listen()`. These arguments are documented on [nodejs.org](http://nodejs.org/api/http.html#http_server_listen_port_hostname_backlog_callback). The following is a useless Koa application bound to port `3000`:
 
 ```js
-var koa = require('koa');
+const koa = require('koa');
-var app = new Koa();
+const app = new Koa();
 app.listen(3000);
 ```
 
   The `app.listen(...)` method is simply sugar for the following:
 
 ```js
-var http = require('http');
+const http = require('http');
-var koa = require('koa');
+const koa = require('koa');
-var app = new Koa();
+const app = new Koa();
 http.createServer(app.callback()).listen(3000);
 ```
 
@@ -123,9 +123,9 @@ http.createServer(app.callback()).listen(3000);
   or on multiple addresses:
 
 ```js
-var http = require('http');
+const http = require('http');
-var koa = require('koa');
+const koa = require('koa');
-var app = new Koa();
+const app = new Koa();
 http.createServer(app.callback()).listen(3000);
 http.createServer(app.callback()).listen(3001);
 ```

docs/api/request.md

@@ -96,7 +96,7 @@ this.request.href
   Get request `Content-Type` void of parameters such as "charset".
 
 ```js
-var ct = this.request.type;
+const ct = this.request.type;
 // => "image/png"
 ```
 

docs/api/response.md

@@ -145,7 +145,7 @@ If `response.status` has not been set, Koa will automatically set the status to
   Get a response header field value with case-insensitive `field`.
 
 ```js
-var etag = this.get('ETag');
+const etag = this.get('ETag');
 ```
 
 ### response.set(field, value)
@@ -183,7 +183,7 @@ this.set({
   Get response `Content-Type` void of parameters such as "charset".
 
 ```js
-var ct = this.type;
+const ct = this.type;
 // => "image/png"
 ```
 
@@ -214,14 +214,14 @@ this.type = 'png';
   all HTML responses except for streams.
 
 ```js
-var minify = require('html-minifier');
+const minify = require('html-minifier');
 
 app.use(function *minifyHTML(next){
   yield next;
 
   if (!this.response.is('html')) return;
 
-  var body = this.body;
+  const body = this.body;
   if (!body || body.pipe) return;
 
   if (Buffer.isBuffer(body)) body = body.toString();

docs/guide.md

@@ -14,9 +14,9 @@
 
 ```js
 function *responseTime(next) {
-  var start = new Date;
+  const start = new Date;
   yield next;
-  var ms = new Date - start;
+  const ms = new Date - start;
   this.set('X-Response-Time', ms + 'ms');
 }
 
@@ -27,9 +27,9 @@ app.use(responseTime);
 
 ```js
 app.use(function *(next){
-  var start = new Date;
+  const start = new Date;
   yield next;
-  var ms = new Date - start;
+  const ms = new Date - start;
   this.set('X-Response-Time', ms + 'ms');
 });
 ```
@@ -92,7 +92,7 @@ function logger(format) {
   format = format || ':method ":url"';
 
   return function *(next){
-    var str = format
+    const str = format
       .replace(':method', this.method)
       .replace(':url', this.url);
 
@@ -218,12 +218,12 @@ app.use(function *(next){
 
 
 ```js
-var fs = require('co-fs');
+const fs = require('co-fs');
 
 app.use(function *(){
-  var paths = yield fs.readdir('docs');
+  const paths = yield fs.readdir('docs');
 
-  var files = yield paths.map(function(path){
+  const files = yield paths.map(function(path){
     return fs.readFile('docs/' + path, 'utf8');
   });
 
@@ -255,10 +255,10 @@ $ DEBUG=koa* node --harmony examples/simple
   For example:
 
 ```js
-var path = require('path');
+const path = require('path');
-var static = require('koa-static');
+const static = require('koa-static');
 
-var publicFiles = static(path.join(__dirname, 'public'));
+const publicFiles = static(path.join(__dirname, 'public'));
 publicFiles._name = 'static /public';
 
 app.use(publicFiles);