const items = [{
id: 1,
name: 'ball'
},{
id: 2,
name: 'axe'
}]
//says I want to update item 2
let input = 'laptop', id = 2
updated_item = items.map(o => o.id === id ? ({ ...o, name: input }) : o) });
console.log(updated_item) // worked
但只是好奇，我也知道reduce是map，foreEach和filter的基础，我想尝试使用reduce来实现上述逻辑
const updated_item_using_reduce = items.reduce((accum, o, i) => {
if(o.id === id) {
//what to do here? change value of name put o into accum? by using push?
}
//else have to assign o to accum, but can't use push I think
}, [])
与其他答案类似，更加简洁：
items.reduce((accum, o, i) => {
return [...accum, (o.id === id) ? {...o, name: input} : o];
}, []);
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我来说两句