按顺序将对象添加到对象数组中
按顺序将对象添加到对象数组中
提问于 2020-09-29 22:08:14
我想知道是否有一种方法可以根据值动态地将对象添加到对象数组中？例如，我有一个对象数组：
[
{category:A, num:5},
{category:B, num:2}
] 我想创建另一个对象数组，其中对象是相同的，但根据num的值进行重复(因此类别A重复5次，类别B重复2次)：
[
{category:A, num:5, repeated:1},
{category:A, num:5, repeated:2},
{category:A, num:5, repeated:3},
{category:A, num:5, repeated:4},
{category:A, num:5, repeated:5},
{category:B, num:2, repeated:1},
{category:B, num:2, repeated:2}
]我尝试过map、forEach、for循环，但都不起作用。我是javascript的新手，有人能帮上忙吗？
回答 2
Stack Overflow用户
回答已采纳
发布于 2020-09-29 22:25:35
您可以使用flatMap和map的组合来完成此操作
var input = [
{category:"A", num:5},
{category:"B", num:2}
] ;
var result = input.flatMap(e => [...new Array(e.num)].map( (x,i) => ({
category:e.category,
num: e.num,
repeated: i+1
})));
console.log(result);
Stack Overflow用户
发布于 2020-09-29 22:25:05
您可以使用flatMap来完成此操作-
const repeat = ({ num = 0, ...t }) =>
num === 0
? []
: [ ...repeat({ ...t, num: num - 1 }), { ...t, num, repeated: num } ]
const input =
[ { category: "A", num: 5}, { category: "B", num: 2 } ]
const output =
input.flatMap(repeat)
console.log(output)
输出-
[
{ category: "A", num: 1, repeated: 1 },
{ category: "A", num: 2, repeated: 2 },
{ category: "A", num: 3, repeated: 3 },
{ category: "A", num: 4, repeated: 4 },
{ category: "A", num: 5, repeated: 5 },
{ category: "B", num: 1, repeated: 1 },
{ category: "B", num: 2, repeated: 2 }
]页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/64121355
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