Question

116

Find duplicate values inside array of objects

rated 0 times [ 120] [ 4] / answers: 1 / hits: 17156 / 9 Years ago, tue, january 12, 2016, 12:00:00

What is the best way in JavaScript to go over array of object and check if an certain value already exist in one of the property of the array objects?
For example: I have array of objects as follow:
[{name:team1,members:3},{name:bestteam,members:4}]
Now I want to add a new object but I want to check that this object property name do not exist in the array before adding it

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gageherberth

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3 Years ago

answered 9 Years ago jaelyn · Accepted Answer

Try this

function checkIfNameExists(arr, newName) {

    return arr.some(function(e) {

        return e.name === newName;

    });

}

where arr is your array and newName is the name to check.

You could also make it less ad hoc by passing the property to compare as a parameter, like so

function checkIfNameExists(arr, prop, newVal) {

    return arr.some(function(e) {

        return e[prop] ? e[prop] === newVal : false;

    });

}