Stack Overflow Asked by CodeRocks on November 12, 2021
In my ReactJS application, I have an array of dictionaries stored as a state called items that looks like this:
this.state = {
items: []
}
I then add items to the list after certain events, ex: click a button, which causes this.state.items to continue to grow to look like something like this:
items: [{"item": "milk", "price": 3.00}, {"item": "eggs", "price": 5.00}]
The items state directly influences my UI because
this.state.items.map((item, i) => <><h1>{item.item}</h1><p>{item.price}</p></>)
My question is: Is this causing my UI to have to re-render items in the items list that have already been renders every time the items state changes. If so, how do I fix that?
Thank you!
That depends on how you set the state, if you use the provided this.setState
then yes, react will notice and re-render your app. If you instead do state = { /* some new state */ }
then it might not re-render. I hope this answers your question.
Please next time just check the React docs (State and Lifecycle)
Answered by DownloadPizza on November 12, 2021
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