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+# co
+
+[![Gitter][gitter-image]][gitter-url]
+[![NPM version][npm-image]][npm-url]
+[![Build status][travis-image]][travis-url]
+[![Test coverage][coveralls-image]][coveralls-url]
+[![Downloads][downloads-image]][downloads-url]
+
+  Generator based control flow goodness for nodejs and the browser,
+  using promises, letting you write non-blocking code in a nice-ish way.
+
+## Co v4
+
+  `co@4.0.0` has been released, which now relies on promises.
+  It is a stepping stone towards [ES7 async/await](https://github.com/lukehoban/ecmascript-asyncawait).
+  The primary API change is how `co()` is invoked.
+  Before, `co` returned a "thunk", which you then called with a callback and optional arguments.
+  Now, `co()` returns a promise.
+
+```js
+co(function* () {
+  var result = yield Promise.resolve(true);
+  return result;
+}).then(function (value) {
+  console.log(value);
+}, function (err) {
+  console.error(err.stack);
+});
+```
+
+  If you want to convert a `co`-generator-function into a regular function that returns a promise,
+  you now use `co.wrap(fn*)`.
+
+```js
+var fn = co.wrap(function* (val) {
+  return yield Promise.resolve(val);
+});
+
+fn(true).then(function (val) {
+
+});
+```
+
+## Platform Compatibility
+
+  `co@4+` requires a `Promise` implementation.
+  For versions of node `< 0.11` and for many older browsers,
+  you should/must include your own `Promise` polyfill.
+
+  When using node 0.11.x or greater, you must use the `--harmony-generators`
+  flag or just `--harmony` to get access to generators.
+
+  When using node 0.10.x and lower or browsers without generator support,
+  you must use [gnode](https://github.com/TooTallNate/gnode) and/or [regenerator](http://facebook.github.io/regenerator/).
+
+  io.js is supported out of the box, you can use `co` without flags or polyfills.
+
+## Installation
+
+```
+$ npm install co
+```
+
+## Associated libraries
+
+Any library that returns promises work well with `co`.
+
+- [mz](https://github.com/normalize/mz) - wrap all of node's code libraries as promises.
+
+View the [wiki](https://github.com/visionmedia/co/wiki) for more libraries.
+
+## Examples
+
+```js
+var co = require('co');
+
+co(function *(){
+  // yield any promise
+  var result = yield Promise.resolve(true);
+}).catch(onerror);
+
+co(function *(){
+  // resolve multiple promises in parallel
+  var a = Promise.resolve(1);
+  var b = Promise.resolve(2);
+  var c = Promise.resolve(3);
+  var res = yield [a, b, c];
+  console.log(res);
+  // => [1, 2, 3]
+}).catch(onerror);
+
+// errors can be try/catched
+co(function *(){
+  try {
+    yield Promise.reject(new Error('boom'));
+  } catch (err) {
+    console.error(err.message); // "boom"
+ }
+}).catch(onerror);
+
+function onerror(err) {
+  // log any uncaught errors
+  // co will not throw any errors you do not handle!!!
+  // HANDLE ALL YOUR ERRORS!!!
+  console.error(err.stack);
+}
+```
+
+## Yieldables
+
+  The `yieldable` objects currently supported are:
+
+  - promises
+  - thunks (functions)
+  - array (parallel execution)
+  - objects (parallel execution)
+  - generators (delegation)
+  - generator functions (delegation)
+
+Nested `yieldable` objects are supported, meaning you can nest
+promises within objects within arrays, and so on!
+
+### Promises
+
+[Read more on promises!](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
+
+### Thunks
+
+Thunks are functions that only have a single argument, a callback.
+Thunk support only remains for backwards compatibility and may
+be removed in future versions of `co`.
+
+### Arrays
+
+`yield`ing an array will resolve all the `yieldables` in parallel.
+
+```js
+co(function* () {
+  var res = yield [
+    Promise.resolve(1),
+    Promise.resolve(2),
+    Promise.resolve(3),
+  ];
+  console.log(res); // => [1, 2, 3]
+}).catch(onerror);
+```
+
+### Objects
+
+Just like arrays, objects resolve all `yieldable`s in parallel.
+
+```js
+co(function* () {
+  var res = yield {
+    1: Promise.resolve(1),
+    2: Promise.resolve(2),
+  };
+  console.log(res); // => { 1: 1, 2: 2 }
+}).catch(onerror);
+```
+
+### Generators and Generator Functions
+
+Any generator or generator function you can pass into `co`
+can be yielded as well. This should generally be avoided
+as we should be moving towards spec-compliant `Promise`s instead.
+
+## API
+
+### co(fn*).then( val => )
+
+Returns a promise that resolves a generator, generator function,
+or any function that returns a generator.
+
+```js
+co(function* () {
+  return yield Promise.resolve(true);
+}).then(function (val) {
+  console.log(val);
+}, function (err) {
+  console.error(err.stack);
+});
+```
+
+### var fn = co.wrap(fn*)
+
+Convert a generator into a regular function that returns a `Promise`.
+
+```js
+var fn = co.wrap(function* (val) {
+  return yield Promise.resolve(val);
+});
+
+fn(true).then(function (val) {
+
+});
+```
+
+## License
+
+  MIT
+
+[npm-image]: https://img.shields.io/npm/v/co.svg?style=flat-square
+[npm-url]: https://npmjs.org/package/co
+[travis-image]: https://img.shields.io/travis/tj/co.svg?style=flat-square
+[travis-url]: https://travis-ci.org/tj/co
+[coveralls-image]: https://img.shields.io/coveralls/tj/co.svg?style=flat-square
+[coveralls-url]: https://coveralls.io/r/tj/co
+[downloads-image]: http://img.shields.io/npm/dm/co.svg?style=flat-square
+[downloads-url]: https://npmjs.org/package/co
+[gitter-image]: https://badges.gitter.im/Join%20Chat.svg
+[gitter-url]: https://gitter.im/tj/co?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge