Best to check for duplicate before a arr.push()?

Hi all,

With a simply value, checking for duplicates before pushing to the array is like this:

myArray.indexOf(value) === -1) {myArray.push(value);}

But I am a bit lost when it come to an array like this:

                        myArray.push({
                            id: data.id,
                            first_name: data.first_name,
                            last_name: data.last_name
                        });

Any idea please?

Thank you.

SilenceBringer

4 years ago

Best Answer

Level 55

@user1980 do you need to check by id only or whole object?

By id:

if (!myArray.find(item => item.id === data.id)) { // search by id
	myArray.push({
		id: data.id,
    	first_name: data.first_name,
    	last_name: data.last_name
 	});
}

for entire object - compare all props or use something like https://lodash.com/docs/4.17.15#isEqual

User1980

4 years ago

Level 4

Thanks, this will do it.

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