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javascriptarrayskeymax
Joey Augustin
Joey Augustin

Reputation: 3

Finding the key of the max value in a javascript array

I have an empty array into which I am pushing values using javascript. I am able to find the max value of the array and set that to a variable using the following:

Array.max = function( array ){
    return Math.max.apply( Math, array );
};

var maxX = Array.max(xArray);

How can I find the key associated with that value?

Upvotes: 0

Views: 10612

Answers (1)

Lekensteyn
Lekensteyn

Reputation: 66405

Assuming that the values are unique, you could use Array.indexOf:

var maxX = Array.max(xArray);
var index = xArray.indexOf(maxX);

If the keys are not unique, index will contain the key of the first element found. If the value does not exist at all, the "key" will be -1.

Upvotes: 4

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