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reactのstateはsetStateした瞬間に更新されるわけではない😭

More than 1 year has passed since last update.

reactでsetStateした瞬間にstateが更新されると思われがちだが。。。(自分もそう思っていた)

実際は「renderメソッドが呼ばれて描画されるまでにはstateが更新されるようになっている」という認識に公式docを読んでから至った。


Because this.props and this.state may be updated asynchronously, you should not rely on their values for calculating the next state.

https://reactjs.org/docs/state-and-lifecycle.htmlより

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