How to get object length [duplicate] which has specific values code example

Example: find duplicates in an object array

npm i find-array-duplicates

import duplicates from 'find-array-duplicates'

const names = [
 { 'age': 36, 'name': 'Bob' },
 { 'age': 40, 'name': 'Harry' },
 { 'age': 1,  'name': 'Bob' }
]
 
duplicates(names, 'name').single()
// => [{ 'age': 36, 'name': 'Bob' }]