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JavaScript - get index of greatest value in array

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Created by:

Dragontry

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In this article, we would like to show you how to get the index of the greatest value in an array in JavaScript.

Quick solution:

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var numbers = [2, 3, 1]
​
var indexOfMax = numbers.indexOf(Math.max(...numbers));
​
console.log(indexOfMax);  // 1

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Note:

This solution is not optimal.

Practical example

Edit

In this example, we present a reusable function that also works in older web browsers.

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function indexOfMax(array) {
    if (array.length === 0) {
        return -1;
    }
​
    var max = array[0];
    var result = 0;
​
    for (var i = 1; i < array.length; ++i) {
        if (array[i] > max) {
            result = i;
            max = array[i];
        }
    }
​
    return result;
}
​
​
// Usage example:
​
var numbers = [2, 3, 1];
​
var maxIndex = indexOfMax(numbers);
​
console.log(maxIndex); // 1