get index of matched element between two array of objects in javascript

Question

I have two array of objects. I want to get the index of matched element from array 2. How to find that?

This is an example.

Array 1

selectedProduct: [{id:2, name:"product 1", category:"home"}]

Array 2

allProducts: [{id:1, name:"product 3", category:"grocery"},
             {id:2, name:"product 1", category:"home"},{id:3, name:"product 4",category:"vegetables"}]

Code snippet:

const index = this.allProducts.findIndex(item => this.selectedproduct.filter(entry => entry.id === item.id))

But, it is returning 0. How can i get the index of matched element?

@user7411584 please mark the answer as the solution if it solved the problem so future visitors can benefit from it as well. — Majed Badawi
– Majed Badawi, Commented Sep 27, 2020 at 18:23

Majed Badawi · Accepted Answer · 2020-09-27 10:41:54Z

2

Use some instead:

let selectedProduct = [
  {id:2, name:"product 1", category:"home"}
];
let allProducts = [
  {id:1, name:"product 3", category:"grocery"},
  {id:2, name:"product 1", category:"home"},
  {id:3, name:"product 4",category:"vegetables"}
]

const index = allProducts.findIndex(item => selectedProduct.some(entry => entry.id === item.id));

console.log(index);

edited Sep 27, 2020 at 10:41

answered Sep 27, 2020 at 10:39

Majed Badawi

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2 Comments

Patrick Roberts Over a year ago

While this does technically work, that's not the purpose of find, which returns the first matching element or undefined. some is more appropriate since it returns a boolean true even if the element found is falsy.

Majed Badawi Over a year ago

@PatrickRoberts thanks for the comment. Yes some is better for this case.

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