/Javascript/React/React native pure component vs component

React native pure component vs component

The major difference between React.PureComponent and React.Component is PureComponent does a shallow comparison on state change. It means that when comparing scalar values it compares their values, but when comparing objects it compares only references. It helps to improve the performance of the app.

You should go for React.PureComponent when you can satisfy any of the below conditions.

    State/Props should be an immutable object
    State/Props should not have a hierarchy
    You should call forceUpdate when data changes

If you are using React.PureComponent you should make sure all child components are also pure.

    is there any performance impact in using React.component that we may consider going for React.PureComponent?

Yes, it will increase your app performance (because of shallow comparison)

    I am guessing shouldComponentUpdate() of Purecomponent performs only shallow comparisons . If this is the case can' t the said method used for deeper comparisons?

You guessed it correctly. You could use it if you satisfy any of the conditions I mentioned above.

    "Furthermore, React.PureComponent's shouldComponentUpdate() skips prop updates for the whole component subtree" - Does this mean that prop changes are ignored?

Yes, prop changes will be ignored If it couldn't find difference in shallow comparison.

Source: stackoverflow.com

Similar codes

0 vote144 views1 answer
11. Which of the following metals catch fire on reaction with air? A. Magnesium B. Manganese C. Potassium D. Calcium
Javascript React
0 vote149 views1 answer
Line separator with text in the center react native
Javascript React
0 vote194 views1 answer
Coreui react change background color
Javascript React
13 votes128 views2 answers
Download react devtools for chrome
Javascript React
0 vote151 views2 answers
Airbnb and eslint react native
Javascript React
2 votes136 views2 answers
Prevent a page from refreshing in react
Javascript React
0 vote82 views1 answer
React create element from string
Javascript React
0 vote129 views1 answer
React sagas state
Javascript React
5 votes130 views1 answer
How to host react app on heroku
Javascript React
3 votes108 views2 answers
React navigation header transparent
Javascript React