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Post: Introduction to JavaScript – Math Operators
JavaScript Math Operators
JavaScript supports several math operators that help perform arithmetic calculations in code. These include:
| Operator | Description |
|---|---|
+ |
Addition |
- |
Subtraction |
* |
Multiplication |
/ |
Division |
These operators behave just as you might expect from basic arithmetic. Let’s look at an example:
In this example, each line uses a different mathematical operator to log a calculated value to the console.
Feel free to modify the code and run it to see how changing numbers affects the output. The more you practice, the better you’ll get!
Additional Arithmetic Operators
Beyond basic addition, subtraction, multiplication, and division, JavaScript supports several other useful arithmetic operators:
| Operator | Description | Example | Result |
|---|---|---|---|
% |
Modulus (remainder) | 5 % 2 |
1 (5 divided by 2 has a remainder of 1) |
++ |
Increment (add 1) | let x = 5; x++ |
6 (x becomes 6) |
-- |
Decrement (subtract 1) | let x = 5; x-- |
4 (x becomes 4) |
Operators and Operands
In an arithmetic operation, numbers are called operands and the symbol representing the operation (like +, -, *, /) is called the operator. For example, in the expression 100 + 50:
- 100 and 50 are operands
- + is the operator
Example:
Arithmetic Operations with Variables and Expressions
You can also use variables and expressions in arithmetic operations:
With variables:
With expressions:
Increment and Decrement Operators
The increment (++) and decrement (--) operators are used to increase or decrease a number by 1.
Incrementing:
Decrementing:
Modulus Operator
The modulus (%) operator returns the remainder of a division operation. This can be useful when you need to check if a number is even or odd:
Operator Precedence
Operator precedence defines the order in which operations are performed in an expression. Just like in mathematics, multiplication and division have higher precedence than addition and subtraction. You can change the order using parentheses ().
Example:
To make addition happen first, you can use parentheses:
Practice Time!
Go ahead and try these examples in your own JavaScript code:
Add Two Numbers:
Multiply and Divide:
Conclusion
You’ve just learned the basics of arithmetic operations in JavaScript! From simple addition to more complex operations like modulus and operator precedence, these tools will help you manipulate numbers and create dynamic logic in your code.
As you continue to practice, try experimenting with different combinations of numbers and operators to deepen your understanding.
Next Steps:
a. Try adding more complex math expressions in JavaScript to test your knowledge.
b. Learn about JavaScript comparison operators to expand your understanding of logical conditions!
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About the Author: Bernard Aybout (Virii8)
