ShareSpot

Reference:  https://codeburst.io/when-to-use-component-or-purecomponent-a60cfad01a81 When to use Component or PureComponent I switched to using PureComponent awhile back on the premise of it being a more performant version of Component. This turned out to be true, but the performance gains come with a few strings attached. Let’s dig in to PureComponent and understand why we should be using it. Component and PureComponent have one difference PureComponent  is exactly the same as  Component  except that it handles the shouldComponentUpdate  method for you . When props or state changes,  PureComponent  will do a  shallow comparison  on both props and state.  Component  on the other hand won’t compare current props and state to next out of the box. Thus, the component will re-render by default whenever  shouldComponentUpdate  is called. Shallow Comparison 101 When comparing previous props and state to next, a shal...