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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));

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

Example document.write(Math.ceil(2.6));

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

Example document.write(Math.floor(2.6));

max(x,y,z,...) - gets the highest number of the arguments

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

min(x,y,z,...) - gets the lowest number of the arguments

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

pow(x,y) - gets x to the power of y

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

random() - generates random number between 0 and 1

Example document.write(Math.random());

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

Example document.write(Math.round(2.5));

sqrt(x) - gets the square root of x

Example document.write(Math.sqrt(16));

I've attached my favorite JavaScript and jQuery book. I would encourage you to read it as well.

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  • User

    YogiBuddhaTao69 Nov. 16, 2014, 12:09 a.m.

    @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.

  • User

    chekkal Feb. 2, 2014, 12:20 p.m.

    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