# Find the highest number with JavaScript's Math.max

Posted on Jan 07, 2021

How to use JavaScript Math.max method to find the highest number

When you need to find the highest value of several numbers, you can use JavaScript’s `Math.max` method. The method accepts as many number arguments as you need to pass into it:

``````Math.max(20, 3, 10, 29);

// returns 29
``````

Passing zero arguments will cause the method to return `-Infinity` as value:

``````Math.max();

// returns -Infinity
``````

Passing any other data type as arguments will cause the method to return `NaN`:

``````Math.max("Hello", 1, 2);

// returns NaN
``````

You can also mix the arguments for the method with negative numbers:

``````Math.max(7, -9, -25);

// returns 7
``````

## Finding the maximum value in an array

When you need to find the maximum value in an array of numbers, you can use the `spread` operator (`...`) to pull out the numbers and pass them as arguments into the `Math.max` method:

``````let scores = [7, 4, 6, 8];
let maxNumber = Math.max(...scores);
// maxNumber value is 8
``````

Or you can also use the `reduce` method to compare two elements at a time:

``````let scores = [7, 6, 5];
let max = scores.reduce(function(a, b) {
return Math.max(a, b);
});
``````

The `reduce` method above will perform two times:

1. Compare between `7` and `6`, returns `7`
2. Compare between `7` and `5`, returns `7`

And so the `max` value is `7`

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