Note: This is a legacy React addon, and is no longer maintained.
We don't encourage using it in new code, but it exists for backwards compatibility.
The recommended migration path is to use
; // ES6var PureRenderMixin = ; // ES5 with npm
If you prefer a
<script> tag, you can get it from
<!-- development version --><!-- production version -->
In this case, make sure to put the
<script> tag after React.
If your React component's render function renders the same result given the same props and state, you can use this mixin for a performance boost in some cases.
const createReactClass = ;;
Under the hood, the mixin implements shouldComponentUpdate, in which it compares the current props and state with the next ones and returns
false if the equalities pass.
This only shallowly compares the objects. If these contain complex data structures, it may produce false-negatives for deeper differences. Only mix into components which have simple props and state, or use
forceUpdate()when you know deep data structures have changed. Or, consider using immutable objects to facilitate fast comparisons of nested data.
shouldComponentUpdateskips updates for the whole component subtree. Make sure all the children components are also "pure".