Check if object property value is unique and if not filter out - JS

Question

I am building a small webapp and I am using this API which has around 485 objects in it. Those objects have specific property center. It can happen that the center property sometimes is equel (and not unique) to other object' center. How can I filter out the duplicates?

My code so far

function call() {

    fetch('https://data.nasa.gov/resource/9g7e-7hzz.json')
        .then((response) => {
            return response.json();
        })
        .then((data) => {
            locations = data;
            getLocations(locations);
        })

}

function getLocations(locations) {

    //Filter out duplicates and push it to an array
    locations.forEach((location) => {

        console.log(location.center);

    })



}

So the result I expect is an array with objects, with unique values in the center property. Can someone help me out?

score 0 · Answer 1 · answered Apr 01 '18 at 14:58

0

Set can help you here:

function getLocations(locations) {
    let centers = new Set();
    let uniques = [];
    for (let location of locations) {
        if (!centers.has(location.center)) {
            centers.add(location.center);
            uniques.push(location);
        }
    }
    return uniques;
}

answered Apr 01 '18 at 14:58

Máté Safranka

4,081
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@baao please argument – bugs Apr 01 '18 at 15:02
2

@baao Care to explain why? I'm willing to accept there's something I overlooked, but please be constructive. – Máté Safranka Apr 01 '18 at 15:02
@baao your response is terrible... – Matus Dubrava Apr 01 '18 at 15:05
@baao did you delete your comment? – bugs Apr 01 '18 at 15:05
he did, what a nice guy, pleasure to meet such... – Matus Dubrava Apr 01 '18 at 15:09

Check if object property value is unique and if not filter out - JS

1 Answers1