# JavaScript Math.max() Method

MD Niaz Rahman Khan Jan 30, 2023

The `Math.max()` method finds out the largest number from the given numbers. We can pass multiple numbers as the parameter.

But in general, it expects at least two numbers as the parameter so that it can compare them and return the largest one.

## Syntax of `Math.max()`

``````Math.max(num1, num2, ....., numN)
``````

### Parameters

`num` The parameter `num` refers to a numeric value.

### Return

The `Math.max()` method returns the highest value from the given values as the parameter.

If any of the values passed in the parameter is non-numeric that can be converted as `NaN`, this method will return `NaN`.

This method will return `-Infinity` if nothing is passed as the parameter.

## Example 1: Use the `Math.max()` Method in JavaScript

``````const result1 = Math.max(1, 21, 11, 40, 5)
const result2 = Math.max(-10, -32, -33, -3, -6)

console.log(result1)
console.log(result2)
``````

Output:

``````40
-3
``````

First, we take some positive numbers and use this method to find the maximum value. This method returns `40` as it is the highest number among the given numbers.

Second, we take some negative numbers to find out the maximum value. It returns `-3`, which is the largest number among all given negative numbers.

## Example 2: Use the `Array.reduce()` With the `Math.max()` Method

``````const arr1 = [10, 50, 1, 33, 20]
const arr2 = []

const result1 = arr1.reduce((x, y) => Math.max(x, y), -Infinity)
const result2 = arr2.reduce((x, y) => Math.max(x, y), -Infinity)

console.log(result1)
console.log(result2)
``````

Output:

``````50
-Infinity
``````

The `Array.reduce()` method iterates the whole array and applies the `Math.max()` method. It compares the numeric values of the array and returns the largest one.

It will return `-Infinity` if the array does not contain any value.

## Example 3: Use the `Function.prototype.apply()` With the `Math.max()` Method

``````const arr = [10, 50, 1, 40, 11]

function getMaxNumFromArray(arr){
return Math.max.apply(null, arr)
}

console.log(getMaxNumFromArray(arr))
``````

Output:

``````50
``````

The `Math.max()` method does not work with an array. The `Function.prototype.apply()` is used with `Math.max()` to get the maximum number from an array.

## Example 4: Use the Spread Operator With the `Math.max()` Method

``````const arr = [10, 50, 31, 17, 26]
const result = Math.max(...arr)

console.log(result)
``````

Output:

``````50
``````

The spread operator `...` converts an array into individual elements. The `Math.max()` method finds the largest number among those elements of an array.

## Example 5: Use the `Math.max()` Method With Exception

``````const result1 = Math.max(11, 22, 'a')
const result2 = Math.max()

console.log(result1)
console.log(result2)
``````

Output:

``````NaN
-Infinity
``````

First, we pass some numbers and a string as the parameter of this method. This method returns `NaN` as it cannot deal with non-numeric numbers that can be converted into `NaN`.

Second, we pass nothing in the parameter of this method, and it returns `-Infinity`.

Niaz is a professional full-stack developer as well as a thinker, problem-solver, and writer. He loves to share his experience with his writings.