如何通过与id进行比较来合并三个不同的数组？ 在Angular 6中

Question

阵列：

 array1 = [{id:1, name:"raju"},{id:2, name:"ravi"},{id:4, name:"john"},{id:6, name:"jack"}];
 array2= [{id:1, degree:"b.com"},{id:3, degree:"b.a"},{id:4, degree:"c.a"},{id:5, degree:"horticulture"}];
 array3= [{id:1, age:20},{id:3, age:21},{id:6, age:27},{id:7, age:25}];

要求的结果是：

resultarray = [
    {id:1, name: "raju", degree:"b.com",age:20},
    {id:2, name: "ravi"},
    {id:3, degree:"b.a", age:21},
    {id:4, name:"john", degree:"c.a"},
    {id:5, degree:"horticulture"},
    {id:6, name:"jack", age:27},
    {id:7, age:25}
 ] 

我尝试了不同的功能，并尝试了两个数组，但无法合并没有id比较的对象..

Answer 1

您可以使用reduce和destructuring

这里的想法是

• 首先将所有数组合并到一个数组中。
• 现在使用reduce我们在op对象中创建id作为键
• 如果id键已经存在，我们合并inp和op[inp.id]
• 如果id不存在，我们创建一个值为inp的新密钥

 let array1 = [{id:1, name:"raju"},{id:2, name:"ravi"},{id:4, name:"john"},{id:6, name:"jack"}]; let array2= [{id:1, degree:"b.com"},{id:3, degree:"ba"},{id:4, degree:"ca"},{id:5, degree:"horticulture"}]; let array3= [{id:1, age:20},{id:3, age:21},{id:6, age:27},{id:7, age:25}]; let temp = [...array1,...array2,...array3] let op = temp.reduce((op,inp)=>{ op[inp.id] = op[inp.id] || inp op[inp.id] = {...op[inp.id],...inp} return op },{}) console.log(Object.values(op)) 

Answer 2

可能的解决方案：

 let array1 = [{id:1, name:"raju"},{id:2, name:"ravi"},{id:4, name:"john"},{id:6, name:"jack"}]; let array2= [{id:1, degree:"b.com"},{id:3, degree:"ba"},{id:4, degree:"ca"},{id:5, degree:"horticulture"}]; let array3= [{id:1, age:20},{id:3, age:21},{id:6, age:27},{id:7, age:25}]; let resp = [].concat(array1, array2, array3).reduce((acc, ele) => { let obj = acc.find(x => x.id === ele.id); return obj ? (Object.keys(ele).forEach(x => obj[x] = ele[x]), acc) : acc.concat(ele); }, []) console.log(resp) 

Answer 3

会有比这更好的解决方案，但这是我尝试过的：

将3个数组合并为一个：

let array = [...array1, ...array2, ...array3]

循环遍历项目，然后将值放到“对象”

let object = {}    
array.forEach((item) => {
    object[item.id] = { ...object[item.id],...item}})

最终解决方案

result = Object.values(object)

对象变量将包含

object = { '1': { id: 1, age: 20, name: 'raju', degree: 'b.com' },
      '2': { id: 2, name: 'ravi' },
      '3': { id: 3, age: 21, degree: 'b.a' },
      '4': { id: 4, degree: 'c.a', name: 'john' },
      '5': { id: 5, degree: 'horticulture' },
      '6': { id: 6, age: 27, name: 'jack' },
      '7': { id: 7, age: 25 } }

结果变量将包含

result = [ { id: 1, age: 20, name: 'raju', degree: 'b.com' },
  { id: 2, name: 'ravi' },
  { id: 3, age: 21, degree: 'b.a' },
  { id: 4, degree: 'c.a', name: 'john' },
  { id: 5, degree: 'horticulture' },
  { id: 6, age: 27, name: 'jack' },
  { id: 7, age: 25 } ]