javascript - 创建重复的js数组

Question

例如:我的数组如下所示:

let arr = [{
    name: "Peter"
}, {
    name: "Peter"
}, {
    name: "John"
}, {
    name: "Peter"
}, {
    name: "Sarah"
}, {
    name: "John"
}]

我需要创建数组，它看起来像这样:

let dupArray = [
    [{
        name: "Peter"
    }, {
        name: "Peter"
    }, {
        name: "Peter"
    }],
    [{
        name: "John"
    }, {
        name: "John"
    }],
    [{
        name: "Sarah"
    }]
]

再说一遍，这不是关于复制，而是关于创建重复分组的新数组。

Answer 1

将它们简化为 Map 并获取值():

let arr = [{
  name: "Peter"
}, {
  name: "Peter"
}, {
  name: "John"
}, {
  name: "Peter"
}, {
  name: "Sarah"
}, {
  name: "John"
}];

let dupArr = 
    [...arr.reduce((a,b) => 
        a.set(b.name , (a.get(b.name) || []).concat(b)),
     new Map()).values()];

console.log(dupArr);