将对象数组转换为单个对象

Question

这是我的初始数组：

[ 
   { 
    id: 1,
    name: 'pos',
    code: 'pos123',
    appCode: 22,
   },
  { 
    id: 2,
    name: 'tailor',
    code: 'tailor123',
    appCode: 21,
  } 
]

我想要的输出：

{
   pos123: {
    id: 1,
    name: 'pos',
    code: 'pos123',
    appCode: 22,
  },
  tailor123: {
    id: 2,
    name: 'tailor',
    code: 'tailor123',
    appCode: 21,
  },
}

我试着用map做这件事，但我想不出来。我应该在这里使用reduce吗？

Answer 1

您的输出不是数组--它是一个对象，因此必须使用reduce。您只能使用map将一个数组中的X个项目数转换为另一个数组中的X个项目数。

​

const input=[{id:1,name:'pos',code:'pos123',appCode:22,},{id:2,name:'tailor',code:'tailor123',appCode:21,}]
const output = input.reduce((a, obj) => {
  a[obj.code] = obj;
  return a;
}, {});
console.log(output);

​

Answer 2

可以使用Object.assign将数组映射到预期的键和值形状。尝试：

​

let array = [ 
   { 
    id: 1,
    name: 'pos',
    code: 'pos123',
    appCode: 22,
   },
  { 
    id: 2,
    name: 'tailor',
    code: 'tailor123',
    appCode: 21,
  } 
];

let output = Object.assign(...array.map(x => ({ [x.code]: x })));

console.log(output);

​

Answer 3

var yourArray = [ 
 { 
  id: 1,
  name: 'pos',
  code: 'pos123',
  appCode: 22,
  },
 {  
  id: 2,
  name: 'tailor',
  code: 'tailor123',
  appCode: 21,
 } 
];

//this is what you required
var output =  yourArray.reduce((obj, item) => {
  obj[code] =item;
  return obj;
}, {});