How to find the object containing the highest value in an array

Question

I'm using a library that predicts the emotion of the user in front of the webcam. There are four emotions: angry, sad, surprised and happy. I want to check which emotion has the highest score. When i console.log predictedEmotions I see this:

(4) [{…}, {…}, {…}, {…}]
 0: {emotion: "angry"value: 0.08495773461377512}
 1: {emotion: "sad", value: 0.05993173506165729}
 2: {emotion: "surprised", value: 0.054032595527500206}
 3: {emotion: "happy", value: 0.18562819815754616}

Any ideas on how to get the emotion with the highest value?

Answer 1

You could reduce the array and take the object with the highest value. Then take take the emotion of the object.

 var data = [{ emotion: "angry", value: 0.08495773461377512 }, { emotion: "sad", value: 0.05993173506165729 }, { emotion: "surprised", value: 0.054032595527500206 }, { emotion: "happy", value: 0.18562819815754616 }], highest = data .reduce((a, b) => a.value > b.value ? a : b) .emotion; console.log(highest); 

Answer 2

I'd use reduce

 const highest = arr.reduce((a, b) => a.value > b.value ? a : b, {}); console.log(highest); 

 <script> const arr = [ { emotion: "angry", value: 0.08495773461377512 }, { emotion: "sad", value: 0.05993173506165729 }, { emotion: "surprised", value: 0.054032595527500206 }, { emotion: "happy", value: 0.18562819815754616 } ]; </script> 

Or you could use sort (but I'd prefer reduce because of performance)

 arr.sort((a, b) => b.value - a.value); console.log(arr[0]); 

 <script> const arr = [ { emotion: "angry", value: 0.08495773461377512 }, { emotion: "sad", value: 0.05993173506165729 }, { emotion: "surprised", value: 0.054032595527500206 }, { emotion: "happy", value: 0.18562819815754616 } ]; </script> 

Answer 3

const data = [
            {emotion: "angry", value: 0.08495773461377512},
            {emotion: "sad", value: 0.05993173506165729},
            {emotion: "surprised", value: 0.054032595527500206},
            {emotion: "happy", value: 0.18562819815754616}
        ],
        highest = process(data);

    function process(data) {
        return data.sort(function (a, b) {
            return b.value - a.value;
        });
    }

    console.log("highest==>",highest,"sorted-array ==>",data[0].emotion);