Lets Get JavaScript Maths capabilities and operators

Discover ways to use addition, subtraction, multiplication, division, powers, rounding, modulo and extra on this article…

Getting began!

Welcome to a different put up on Code The Net! Initially, I wish to encourage you to observe alongside on this article. It can make it easier to be taught higher, and in addition make it easier to to recollect what you’ve gotten performed. Let’s begin by making a brand new HTML file with a <script> tag in it:

As soon as that’s performed, open it up in your net browser and also you’re able to go! (don’t neglect to save lots of and reload the web page each time you make a change)

Sorts of numbers

There are two predominant kinds of numbers in JavaScript: floats and integers. Integers are complete numbers with out decimals. Listed below are just a few examples:

  • three
  • zero
  • 156

Floats are numbers which comprise a decimal. You will need to observe that floats may be complete numbers. Wait whaaat? I believed you stated that integers had been complete numbers? Nicely, stuff like 5.zero remains to be thought-about a float, as a result of it has a decimal and might be 5.1.

  • 2.225345
  • zero.zero
  • 42.zero

For essentially the most half, you gained’t have to fret about these differing kinds as a result of JavaScript will mechanically convert them for you (????). Nonetheless, in some programming languages, you’ll have to do it your self. There are additionally some circumstances in JavaScript the place you will must work with changing stuff between floats and integers.

Fundamental operators

Let’s begin proper from the start – with the fundamental operations!


Addition in JavaScript is actually easy – all that you must do is put a plus signal between two numbers, identical to in actual life. Strive it out! Add the next to your script, save, then reload the web page:

It’s also possible to add floats and integers within the one expression:

Clearly, the quantity that’s returned will likely be a float. Shifting on!


Subtraction additionally works simply because it does in actual life. Simple, huh? Listed below are some examples – you may strive them out if you need:


Multiplication is barely totally different to how you’ll do it on paper. Usually, we might simply use a cross image – the letter x on a keyboard. Nonetheless, we are able to’t use that! In programming, we attempt to give every character just one which means. Since x is already a letter, we’ve got to make use of one thing else. In JavaScript, we use the asterisk (*) image. Listed below are some examples of multiplication in JavaScript:


Division additionally works in another way to on paper. Whereas there’s a Unicode symbol for division (÷), it isn’t one thing which you could sort simply in your keyboard and isn’t that generally used. As an alternative, we use the slash (/) signal to imply ‘divided by’. Listed below are some examples:

I simply wish to spotlight the final one on that checklist:

In maths, something divided by zero is the same as infinity (explanation here). Nonetheless, in JavaScript it may well’t equal to “infinity” – in any other case JavaScript would suppose it was a variable! So, we have to capitalize it to make it Infinity. This can be a particular worth in JavaScript (not a variable). It doesn’t actually have many use circumstances however is the result of statements just like the one above.

Enjoyable reality: Infinity — Infinity in JavaScript does not equal 0!


Modulo is one thing that you could be not have heard of earlier than, not like the 4 operations above. Put merely, modulo is the the rest when dividing two numbers. It’s performed by placing a % signal between the 2 numbers. For instance:

Let’s break it down a bit additional. We have now the numbers 24 and 5, separated by the modulo (%) signal. Which means to calculate the reply in our heads, we’d first must divide 24 by 5 (into teams of 5). Right here, we are able to make 4 teams of 5. Nonetheless, we’d nonetheless have an additional Four left over as a the rest. So, the reply is Four. Listed below are another examples – should you nonetheless don’t get it, attempt to do the method above on these:

Math capabilities

In addition to the operators above, there are additionally some capabilities that we are able to use to hold out barely extra superior duties. These capabilities usually observe the type of Math.whateverTheFunctionIs(). It is because Math is an object containing a lot of totally different math-related capabilities. I’ll speak extra about objects in a later article, however you don’t actually have to fret about the way it works for the second. Simply use the syntax that I put right here and also you’ll be advantageous.

To the ability of

We do that utilizing the Math.pow(quantity,energy) operate. For instance, let’s say we wished to sq. the quantity 5:

Wait whaaat? A operate inside the alert operate? Yup. It is because Math.pow is a operate that returns something. You may consider it identical to a variable. So as a substitute of x being equal to 25, Math.pow(5,2) is the same as 25.

It’s also possible to go to larger powers if you need (pun meant ???? *sigh*):

Sq. root & Dice root

You may calculate sq. an dice roots in JavaScript utilizing the Math.sqrt() and Math.cbrt() capabilities. Listed below are some examples which you’ll check out:


We are able to spherical a quantity to an entire quantity utilizing the Math.spherical() operate. Listed below are some examples:

It can spherical up if the decimal a part of the quantity is bigger than or equal to zero.5. In any other case it’s going to spherical down.

Particularly rounding up or down

However what if we wish to particularly spherical up or down? For instance, what if earlier than we wished to spherical 35.82562 downwards? That is the place flooring and ceiling turn out to be useful. Math.flooring() rounds the quantity down it doesn’t matter what, whereas Math.ceil() rounds the quantity up it doesn’t matter what. Word that Math.ceil(6) and even Math.ceil(6.zero) wouldn’t spherical as much as 7. Listed below are some examples:


That’s it for right this moment! This simply lined some primary math operations, however there are numerous extra. Click here for an inventory of all of the capabilities within the Math object (those that begin with Math.). In addition to having capabilities, the Math object additionally has some static values resembling Math.PI – they’re listed on that web page as nicely.

Hopefully, you realized lots from this text! In case you did, I’d be stoked should you shared it on social media.

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That’s it for right this moment! Subsequent time, I’ll be writing about for loops and while loops in JavaScript – they’re actually cool, as a result of you may inform the browser to repeat bits of your code time and again (even with totally different values every time)! See you then ????

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