How to find all id's to an array from array of objects - Javascript

Question

How to find all id's to an array from array of objects. Here through normal for loop I can able to get but using ECMA new features by findAll etc..how to get?

let items = [
      {id: 28, name: "Action", isSelected: true},
      {id: 10770, name: "TV Movie", isSelected: false},
      {id: 53, name: "Thriller", isSelected: true},
      {id: 10752, name: "War", isSelected: false},
      {id: 37, name: "Western", isSelected: true}
    ]

Here I want to find all id's based on isSelected is true.

Use `.filter()`, so something like `items.filter(({isSelected}) => isSelected);` should give you what you're after if I understand your question correctly — Nick Parsons, Sep 30 '19 at 07:04

score 1 · Accepted Answer · answered Sep 30 '19 at 07:05

Using filter and map

let items = [
      {id: 28, name: "Action", isSelected: true},
      {id: 10770, name: "TV Movie", isSelected: false},
      {id: 53, name: "Thriller", isSelected: true},
      {id: 10752, name: "War", isSelected: false},
      {id: 37, name: "Western", isSelected: true}
    ]
    console.log(items.filter(function(e){return e.isSelected}).map(function(e){
    return e.id
    }))

score 1 · Answer 2 · answered Sep 30 '19 at 07:06

Try this:

let items = [
  { id: 28, name: "Action", isSelected: true },
  { id: 10770, name: "TV Movie", isSelected: false },
  { id: 53, name: "Thriller", isSelected: true },
  { id: 10752, name: "War", isSelected: false },
  { id: 37, name: "Western", isSelected: true }
]
let res = items.filter(({ isSelected }) => isSelected).map(({id}) => id);
console.log(res);

score 1 · Answer 3 · answered Sep 30 '19 at 07:06

Simple map function will do your job

let items = [
      {id: 28, name: "Action", isSelected: true},
      {id: 10770, name: "TV Movie", isSelected: false},
      {id: 53, name: "Thriller", isSelected: true},
      {id: 10752, name: "War", isSelected: false},
      {id: 37, name: "Western", isSelected: true}
]

items.map(item => console.log(item.id))

score 1 · Answer 4 · answered Sep 30 '19 at 07:07

First filter the array to get the objects with isSelected as true then use map() to get the id of those objects:

let items = [
      {id: 28, name: "Action", isSelected: true},
      {id: 10770, name: "TV Movie", isSelected: false},
      {id: 53, name: "Thriller", isSelected: true},
      {id: 10752, name: "War", isSelected: false},
      {id: 37, name: "Western", isSelected: true}
];
let res = items.filter(({isSelected}) => isSelected).map(({id}) => id);
console.log(res);

How to find all id's to an array from array of objects - Javascript

4 Answers4