CODEWITHSUNDEEP
reactjsreact-native
ANJANA
ANJANA

Reputation: 47

How to clear array from useState

I am new comer in react-native. How do I clear this useState array?

const [tokenArray, setTokenArray]=useState([]);

// Need to Clear Array this line.
setTokenArray(tokenArray,[]);
  
var arraySize = responseJson.status.split(',').length;
for(var x=1;x<arraySize;x++){
    console.log("X--->"+x)
    setTokenArray(tokenArray => [...tokenArray, responseJson.status.split(',')[x]])
}

Upvotes: 3

Views: 11122

Answers (2)

axtck
axtck

Reputation: 3965

If you want to clear out the array you can just set it to an empty array when calling setTokenArray.

setTokenArray([]);

Upvotes: 1

samthecodingman
samthecodingman

Reputation: 26256

You have a syntax error that you probably got by retyping the other setTokenArray call incorrectly:

setTokenArray(tokenArray,[]);

should be

setTokenArray([]);
// or
setTokenArray(tokenArray => []);

When you pass a function to setTokenArray, the first argument will be the old value of that variable. This is useful for when you need to mutate it like you do inside the for loop.

Upvotes: 6

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