将对象数组合并为按属性值匹配的数组

Question

I am trying to merge in an array to an existing array by a key (id). Is there any easy way to do this?

For example:

people = [{id: 1, name: 'John Doe'}, {id: 2, name: 'Jane Doe'}];
places = [{id: 1, state: 'CA'}, {id: 2, state: 'AK'}];

// expected output I want is
result = [{id: 1, name: 'John Doe', places: {id: 1, state: 'CA'}}, {id: 2, name: 'Jane Doe', places: {id: 2, state: 'AK}'}}];

How can I get places property id to map into people id so basically the ID's match up and they keys are carried in?

Answer 1

Here is the JS way to implement the scenario :

 const people = [{id: 1, name: 'John Doe'}, {id: 2, name: 'Jane Doe'}]; const places = [{id: 1, state: 'CA'}, {id: 2, state: 'AK'}]; const result = people.map(ppl => { ppl.places = places.find(plc => plc.id === ppl.id) return ppl; }) console.log(result) // ES6 way let res = people.map(obj => { let data = places.find(item => item.id === obj.id); return {...obj, places: data} }); console.log('ES6 way ......',res)