Math Javascript

Michael Zippo 04.11.2021

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Computers are really good at math. It’s in their metaphorical blood, given that computers are powered by the 1’s and 0’s that we call binary. When you are programming, there will probably be a point where you want to do some math.

In JavaScript, math always comes out. You can use math to calculate the size of a window. You can use it to calculate if a user is old enough to use your site. You can use math to add two user-supplied numbers.

In this guide, we will explain how to perform mathematical operations in JavaScript using the five main mathematical operators.

Math operators: an update

JavaScript is made up of a number of operators. Some operators allow you to work with strings, while others help you perform JS math functions. In this guide, we are going to focus on a special type of operator called an arithmetic operator.

Arithmetic operators are symbols used to perform mathematical operations. These JS operators are somewhat similar to the ones you learned in school. For this article, we’ll focus on six operators:

Addition (+)
Subtraction (-)
Division (/ )
Multiplication (*)
Modulus (%)
Power (**)

Beginning of face and learn more about each of them.

Before you begin, it should be noted that all JavaScript numbers are stored as numbers. There is no separate data type for floating point (decimal) numbers or integers. We just call them all "numbers".

Add and Subtract

The JavaScript symbols for adding and subtracting JS numbers are the same ones we use in our everyday math life. How convenient! We can add the numbers indicating the numbers we want to add, separated by a plus sign:

Our code returns: 14. We could do a subtraction by substituting our advantage for a minus:

Our code returns: -4.

JavaScript math can work with both positive and negative numbers.

When working with a mathematical sum, it is probably not enough to print it to the console. variables come into play. You can assign numbers in your math problems to store all the numbers you’re working with:

Our code returns: 30. We assigned the value 10 to a and the value 20 to b Then we used the variable c to add these two numbers. It’s super easy!

Multiply and divide

Let’s go up one level and talk about multiplication and division . Unlike the previous examples, we will have to learn two new operators:

The asterisk (*) represents the multiplication.
The slash (/) represents division.

Let’s say we own a cookie factory and we want to figure out how many kilograms of flour we need. Each batch of cookies requires 2 kg of flour and we want to bake five batches. We could calculate how many kilograms of flour we need using this code:

Our code returns: You need 10kg of flour.

You can use the slash to perform split operations.

Let’s say each batch contains 40 cookies and you want to split them into packets. Each pack contains 5 cookies. Now you want to know how many packs you could make. This can be done using the following code:

Our code returns: You can create 8 cookie packages.

Module

The module operator may not be used as widely as the others, but it is still an important part of JavaScript. The modulo operator calculates the remainder of a number after it has been divided.

In JavaScript, the modulo operation is represented using a percent sign. Our last example showed us dividing numbers that can be divided equally. As you know, not all math problems are not run that way ; some return the leftovers.

Going back to our cookie example earlier. Suppose we overestimated the number of cookies we can make in each batch. turns out that each batch will only produce 37 cookies To find out how many packs we can make from our batch we could use this code:

The problem is that we have a deci wrong number ! This is where the module comes in. We could update our t code or calculate the rest of the available cookies:

Our code returns:

We have made some changes to our code. First, we’ve rounded the packsMade value to the nearest whole number. We have used Math.floor () for this purpose. This allows us to see that we can create 7 complete cookie packages.

We therefore used the modulo operator to calculate the remaining cookies that would be left. This tells us that after splitting our packets, there will be two cookies left.

Power

Increase x to the power y. It sounds pretty complicated, especially when you start to use words like exponential. But it doesn’t have to be difficult.

In JavaScript, two asterisks (**) represent the elevation of a number to a power:

This is another way of writing 7 * 7 * 7, but it’s shorter and easier to read.

Order of operations

Mathematics has a specific order of operations. This describes the operations you must perform in which order when faced with a math problem.

This tells us that we need to do everything in parentheses first, then all the power calculations, then the division and so on. Consider the following problem:

The answer to this problem is: 17. JavaScript first calculates 5 * 3 because it is in parentheses. It then adds two to the result of this calculation.

Conclusion

JavaScript provides a range of arithmetic operators that you can use to perform mathematical operations. Some of these operators, such as addition, are the same ones we would use to evaluate a math problem; others have their own symbols.

Remember that when evaluating a math problem, you need to consider BODMAS, the order of operations in which the problem will be read.

Math Javascript __del__: Questions