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TJ Holowaychuk 2013-09-02 19:05:49 -07:00
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@ -20,8 +20,7 @@ function responseTime(next){
app.use(responseTime); app.use(responseTime);
``` ```
If you're a front-end developer you can think any code before `yield next;` as the "capture" phase, Here's another way to write the same thing, inline:
while any code after is the "bubble" phase. Here's another way to write the same thing, inline:
```js ```js
app.use(function(next){ app.use(function(next){
@ -34,6 +33,12 @@ app.use(function(next){
}); });
``` ```
If you're a front-end developer you can think any code before `yield next;` as the "capture" phase,
while any code after is the "bubble" phase. This crude gif illustrates how ES6 generators allow us
to properly utilize stack flow to implement request and response flows:
![koa middleware](https://i.cloudup.com/N7L5UakJo0.gif)
Next we'll look at the best practices for creating Koa middleware. Next we'll look at the best practices for creating Koa middleware.
## Middleware Best Practices ## Middleware Best Practices