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reactjsreact-hooks
SkyeBoniwell
SkyeBoniwell

Reputation: 7092

React Hook to set a state value if null?

I have a state value like this:

const [gamerTag, setGamerTagState] = useState(props.gamerTag);

But I need to change it to a empty string if gamerTag is null, so I tried this:

if (gamerTag === null) {
    gamerTag = "";
}

However now I get a syntax warning that gamerTag is constant.

How can I set gamerTag to an empty string if it's null?

Thanks!

Upvotes: 0

Views: 2816

Answers (2)

Gysi Rrjolli
Gysi Rrjolli

Reputation: 81

It seems like you may have a little bit of a wrong understanding when it comes to using the react state hook.

You should pass the default value of a state in the function call useState("default value"). Then if you want to update the value of the state depending on some condition you should always use setState(value), in your case it is setGamerTag("").

Updating the state value directly is wrong because react depends on using the setState(value) function call to update the state, that's why we use const [state, setState] = useState() with the const identifier, so that it prevents us from assigning the state directly. So to fix your error you should do:

       if (gamerTag === null){
            setGamerTag("");
        }

Upvotes: 1

Carlotta
Carlotta

Reputation: 334

you could do:

const [gamerTag, setGamerTagState] = useState(props.gamerTag || '');

or you can do:

if (gamerTag === null) {
  setGamerTagState('')
}

If you want to change a value of a state, you always need to use/call the "set...." function. So in your example you need to call "setGamerTagSetate(Value)"

Upvotes: 1

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