ES6按字段类型分组数组对象 [英] ES6 group array objects by field type

问题描述

是否有一种简洁的es6功能性方法可以按类型将项目分组，因为它是不可变的?

Is there a terse es6 functional way to group items by type in that it's immutable?

accounts.json

   [
         {"account": {"name": "Bob's credit", "type": "credit", "id": "1"}},
         {"account": {"name": "savings", "type": "savings", "id": "2"}},
         {"account": {"name": "vacation savings", "type": "savings", "id": "3"}},
         {"account": {"name": "son's savings", "type": "savings", "id": "4"},
         {"account": {"name": "wife's credit card", "type": "savings", "id": "5"}
   ]

期望

[
{"savings": [
    {"account": {"name": "savings", "type": "savings", "id": "2"}},
    {"account": {"name": "vacation savings", "type": "savings", "id": "3"}},
    {"account": {"name": "son's savings", "type": "savings", "id": "4"}
]},

{"checking": [
   {"account": {"name": "wife's credit card", "type": "savings", "id": "5"}
]

推荐答案

您可以使用

You can use Array#reduce to group your list by its elements inner type property :

const data = [
     {"account": {"name": "Bob's credit", "type": "credit", "id": "1"}},
     {"account": {"name": "savings", "type": "savings", "id": "2"}},
     {"account": {"name": "vacation savings", "type": "savings", "id": "3"}},
     {"account": {"name": "son's savings", "type": "savings", "id": "4"}},
     {"account": {"name": "wife's credit card", "type": "savings", "id": "5"}}
];

const res = data.reduce((acc, curr) => {
  if(!acc[curr.account.type]) acc[curr.account.type] = []; //If this type wasn't previously stored
  acc[curr.account.type].push(curr);
  return acc;
},{});

console.log(res);

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