Question

When passing values to the Math.max or Math.min function in JavaScript, they return the highest and lowest values from the input respectively.

However, if a piece of data that is undefined is entered, e.g.

Math.max(5,10,undefined);

The result returned is NaN. Is there a simply way to fix this using JS/jQuery?

Answer 1

I assume the undefined is actually some variable.

You can substitute -Infinity for any NaN value to ensure a number.

var foo;

Math.max(5, 10, isNaN(foo) ? -Infinity : foo); // returns 10

Same concept can be used on Math.min, but with Infinity:

var foo;

Math.min(5, 10, isNaN(foo) ? Infinity : foo); // returns 5