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Math.max

The Math.max() function returns the largest of zero or more numbers.

Syntax

Math.max([value1[, value2[, ...]]])

Parameters

value1, value2, ...
Numbers.

Return value

The largest of the given numbers. If at least one of the arguments cannot be converted to a number, NaN is returned.

Description

Because max() is a static method of Math, you always use it as Math.max(), rather than as a method of a Math object you created (Math is not a constructor).

If no arguments are given, the result is -Infinity.

If at least one of arguments cannot be converted to a number, the result is NaN.

Examples

Using Math.max()

Math.max(10, 20);   //  20
Math.max(-10, -20); // -10
Math.max(-10, 20);  //  20

Getting the maximum element of an array

Array.reduce() can be used to find the maximum element in a numeric array, by comparing each value:

var arr = [1,2,3];
var max = arr.reduce(function(a, b) {
    return Math.max(a, b);
});

The following function uses Function.prototype.apply() to get the maximum of an array. getMaxOfArray([1, 2, 3]) is equivalent to Math.max(1, 2, 3), but you can use getMaxOfArray() on programmatically constructed arrays. This should only be used for arrays with relatively few elements.

function getMaxOfArray(numArray) {
  return Math.max.apply(null, numArray);
}

The new spread operator is a shorter way of writing the apply solution to get the maximum of an array:

var arr = [1, 2, 3];
var max = Math.max(...arr);

However, both spread (...) and apply will either fail or return the wrong result if the array has too many elements, because they try to pass the array elements as function parameters. See Using apply and built-in functions for more details. The reduce solution does not have this problem.

Specifications

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari
Basic support Yes Yes Yes Yes Yes Yes
Feature Android webview Chrome for Android Edge mobile Firefox for Android Opera Android iOS Safari Samsung Internet
Basic support Yes Yes Yes Yes Yes Yes ?

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/max