how to find duplicate item from array using multiple object keys in angular or javascript

 how to find duplicate item from array using multiple object keys

There is a way to find based of multiple key find duplicate records in angular or javascript

 

getDuplicate(items, keys) {

        let duplicates = [];

        for (let i = 0; i < items.length; i++) {

            let matchkey = 0;

            for (let j = 0; j < keys.length; j++) {

                if ((i < (items.length - 1)) && items[i + 1][keys[j]].toLowerCase() === items[i][keys[j]].toLowerCase()) {

                    matchkey++;

                }

            }

            if (matchkey === keys) {

                duplicates.push(items[i]);

            }

        }

        return duplicates;

    }

Example:

const duplicate= this.getDuplicate(CounterParty, ['OperatorId', 'TCID']);