Correct modification of state arrays in React.js

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azihsoyn なるほど

2018/01/12 リンク

kent-where-the-light-is “Your push will mutate the state directly and that could potentially lead to error prone code, even if you are "resetting" the state again afterwards. F.ex, it could lead to that some lifecycle methods like componentDidUpdate won’t trigger. A better option would be as you mentioned: var arrayvar

2017/08/12 リンク

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Correct modification of state arrays in React.js

I want to add an element to the end of a state array, is this the correct way to do it? this.stat... I want to add an element to the end of a state array, is this the correct way to do it? this.state.arrayvar.push(newelement); this.setState({ arrayvar:this.state.arrayvar }); I'm concerned that modifying the array in-place with push might cause trouble - is it safe? The alternative of making a copy of the array, and setStateing that seems wasteful.