[英]How to prevent race conditions with react useState hook
I have a component that uses hooks state (useState) api to track the data.我有一个组件,它使用钩子状态 (useState) api 来跟踪数据。
The object looks like this对象看起来像这样
const [data,setData] = React.useState({})
Now I have multiple buttons which make API requests and set the data with the new key现在我有多个按钮可以发出 API 请求并使用新密钥设置数据
setAPIData = (key,APIdata) => {
const dup = {
...data,
[key]:APIdata
}
setData(dup)
}
Now if I make multiple requests at the same time , it results in race conditions since setting state in react is asynchronous and I get the previous value.现在,如果我同时发出多个请求,则会导致竞争条件,因为在 react 中设置状态是异步的,并且我获得了先前的值。
In class-based components, we can pass an updater function to get the updated value, how to do this hooks based component.在基于类的组件中,我们可以通过一个 updater 函数来获取更新的值,这个基于钩子的组件是如何做的。
You must use setData with a function as its argument.您必须使用带有函数的 setData 作为其参数。 Then it will always get the previous state, no matter what order it will be called.那么它总是会得到之前的状态,不管它会以什么顺序被调用。
setAPIData = (key, APIdata) => {
setData(prevData => ({
...prevData,
[key]: APIdata
}));
};
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