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Update compose documentation #13504

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Jan 25, 2019
Merged

Update compose documentation #13504

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Update compose documentation
mkaz Jan 25, 2019
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Update packages/compose/README.md
chrisvanpatten Jan 25, 2019
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12 changes: 7 additions & 5 deletions packages/compose/README.md
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Expand Up @@ -2,14 +2,16 @@

The `compose` package is a collection of handy [Higher Order Components](https://facebook.github.io/react/docs/higher-order-components.html) (HOCs) you can use to wrap your WordPress components and provide some basic features like: state, instance id, pure...

The **compose** function is an alias to [flowRight](https://lodash.com/docs/#flowRight) from Lodash. It comes from functional programming world and allows to compose any number of functions. An example that illustrates it for two functions:
The `compose` function is an alias to [flowRight](https://lodash.com/docs/#flowRight) from Lodash. It comes from functional programming, and allows you to compose any number of functions. You might also think of this as layering functions; `compose` will execute each function in sequence, passing the output of the function to the next function.
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An example that illustrates it for two functions:

```js
const compose = ( f, g ) => x
=> f( g( x ) );
```

Here's a simplified example of **compose** in use from our code, see [plugin-sidebar](https://github.com/WordPress/gutenberg/blob/master/packages/edit-post/src/components/sidebar/plugin-sidebar/index.js) for full code:
Here's a simplified example of **compose** in use from Gutenberg's [`PluginSidebar` component](https://github.com/WordPress/gutenberg/blob/master/packages/edit-post/src/components/sidebar/plugin-sidebar/index.js):

Using compose:

Expand All @@ -28,7 +30,7 @@ export default compose(
)( PluginSidebarMoreMenuItem );
```

Equivalent to the following without compose:
Without `compose`, the code would look like this:

```js
const applyWithSelect = withSelect( ( select, ownProps ) => {
Expand All @@ -45,7 +47,7 @@ export default withPluginContext(
)
)
);
```


## Installation

Expand All @@ -71,6 +73,6 @@ function WrappedComponent( props ) {
const ComponentWithInstanceIdProp = withInstanceId( WrappedComponent );
```

Refer to each Higher Order Component's README file for more details, see [list of components](https://github.com/WordPress/gutenberg/tree/master/packages/compose/src).
For more details, you can refer to each Higher Order Component's README file. [Available components are located here.](https://github.com/WordPress/gutenberg/tree/master/packages/compose/src)

<br/><br/><p align="center"><img src="https://s.w.org/style/images/codeispoetry.png?1" alt="Code is Poetry." /></p>