Home » Tutorials » JavaScript » Math Object

# Math Object

The JavaScript Math Object might not be used quite as often as the string object, but it is really useful when dealing with numbers. Sometimes we need to find the nearest integer to a number with a decimal (float). Other times, we need to do some sophisticated mathematics on them, such as powers or square roots. The math object is also where random number generation resides.

Number in JavaScript are really simple and so is the Math Object. However, I have sort of mislead you on numbers and the Math Object. See, the Math Object acts upon numbers, they do not utilize the Math Object as a method. As you will see in the examples below, we must perform the Math methods on our numbers. This is why you will see Math.method(number) being used in the references below. I know it seems like once you have a number it should have methods that do these Math Object Methods, but they simply don’t exist.

### Common Math Object Methods

abs(x) – gets absolute value of x

Example
`document.write(Math.abs(-1));`
Result
1

ceil(x) – gets x rounded up to the nearest integer

Example
`document.write(Math.ceil(2.6));`
Result
3

floor(x) – gets x rounded up to the nearest integer

Example
`document.write(Math.floor(2.6));`
Result
2

max(x,y,z,…) – gets the highest number of the arguments

Example
`document.write(Math.max(2,3,4,5));`
Result
5

min(x,y,z,…) – gets the lowest number of the arguments

Example
`document.write(Math.min(2,3,4,5));`
Result
5

pow(x,y) – gets x to the power of y

Example
`document.write(Math.pow(2,3));`
Result
8

random() – generates random number between 0 and 1

Example
`document.write(Math.random());`
Result
0.6697745699866664

round(x) – gets x rounded to the nearest integer

Example
`document.write(Math.round(2.5));`
Result
3

sqrt(x) – gets the square root of x

Example
`document.write(Math.sqrt(16));`
Result
4

• Stewart, Suzy. "Math Object". After Hours Programming. Accessed on August 19, 2022. https://www.afterhoursprogramming.com/tutorial/javascript/math-object/.

• Stewart, Suzy. "Math Object". After Hours Programming, https://www.afterhoursprogramming.com/tutorial/javascript/math-object/. Accessed 19 August, 2022.

### 2 thoughts on “Math Object”

1. @chekkal, True but I think you mean floor(x) – gets x rounded DOWN

I love this site, but there are a lot of typographical errors. I almost wish that we could edit it like wiki, but of course that would compromise the integrity of such a modest site (relative to the traffic on wiki). Still, I wish there was a better way to fix typos than leave a comment, as I doubt the developer has the time to read them all.

2. The description of ceil and floor should be restated (the given definition is the same as round), as follow:
ceil(x) – gets x rounded up to the nearest integer greater or equal to x
floor(x) – gets x rounded up to the nearest integer lesser or equal to x

This site uses Akismet to reduce spam. Learn how your comment data is processed.