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docs: replace the reference to co

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closes #893
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jongleberry 2017-02-24 23:43:21 -06:00
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docs/koa-vs-express.md
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# Koa vs Express
Philosophically, Koa aims to "fix and replace node", whereas Express "augments node".
Koa uses co to rid apps of callback hell and simplify error handling.
It exposes its own `this.request` and `this.response` objects instead of node's `req` and `res` objects.
Koa uses promises and async functions to rid apps of callback hell and simplify error handling.
It exposes its own `ctx.request` and `ctx.response` objects instead of node's `req` and `res` objects.
Express, on the other hand, augments node's `req` and `res` objects with additional properties and methods
and includes many other "framework" features, such as routing and templating, which Koa does not.
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### Generated-based control flow
Thanks to co.
No callback hell.
Better error handling through try/catch.