在一行代码中用传播语法替换数组条目? [英] Replace array entry with spread syntax in one line of code?

问题描述

我正在使用...扩展语法替换反应状态数组中的项目.这有效:

I'm replacing an item in a react state array by using the ... spread syntax. This works:

let newImages = [...this.state.images]
newImages[4] = updatedImage
this.setState({images:newImages})

是否可以在一行代码中做到这一点?像这样吗? (这显然行不通...)

Would it be possible to do this in one line of code? Something like this? (this doesn't work obviously...)

this.setState({images: [...this.state.images, [4]:updatedImage})

推荐答案

使用 Array.slice

this.setState({images: [...this.state.images.slice(0, 3), updatedImage, ...this.state.images.slice(4)]})

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