Check if array of hashes contains hash

Question

Let's say I have a variable like:

var vendors = [
    {
      Name: 'Magenic',
      ID: 'ABC'
     },
    {
      Name: 'Microsoft',
      ID: 'DEF'
    }
];

var v1 = {
      Name: 'Magenic',
      ID: 'ABC'
     };

When I run the following code to search for v1 in vendors using indexOf it always returns -1

console.log(vendors.indexOf(v1));

Even though v1 exists in vendors array it returns -1. What it the proper way to find the index of an object in array of objects using js?

I can use a loop, but it is costly :(

Answer 1

You can use findIndex :

 var vendors = [{ Name: 'Magenic', ID: 'ABC' }, { Name: 'Microsoft', ID: 'DEF' }]; console.log(vendors.findIndex(v => v.ID === 'ABC')) // 0 console.log(vendors.findIndex(v => v.ID === 'DEF')) // 1 

Answer 2

To check if array contains object you can use some() and then check if each key - value pair exists in some object of array with every() , and this will return true/false as result.

 var vendors = [{ Name: 'Magenic', ID: 'ABC' }, { Name: 'Microsoft', ID: 'DEF' }]; var v1 = { Name: 'Magenic', ID: 'ABC' }; var result = vendors.some(function(e) { return Object.keys(v1).every(function(k) { if(e.hasOwnProperty(k)) { return e[k] == v1[k] } }) }) console.log(result) 

Answer 3

This way you can test if an object is contained in an array of objects

 var vendors = [ { Name: 'Magenic', ID: 'ABC' }, { Name: 'Microsoft', ID: 'DEF' } ]; var v1 = { Name: 'Magenic', ID: 'ABC' }; var result = vendors.findIndex(x => x.ID === v1.ID && x.Name === v1.Name) console.log(result);