In this lesson we learn about JavaScript Operators, what they are and how we use them in JavaScript.
If we look at the following sum: 7 + 4 = 11
The + is the operator and the 7 and the 4 are the operands.
So the numbers are called operands and the operation (to be performed between the two operands) is defined by an operator.
In JavaScript we can use the following types of operators.
Type  Description 

Arithmetic Operators 
For adding, subtracting, multiplication and division. 
String Operators  For joining strings together. 
Assignment Operators  For assigning values to variables. 
Comparison Operators  For comparing two different values (equal to, greater than, less than etc.) 
Logical Operators  For determining the logic between variables or values (and, or, not). 
Arithmetic operators perform arithmetic on numbers. The main arithmetic operators are:
Operator  Description  Example 

+ 
For adding two numbers together. 

  For subtracting one number from another. 

*  For multiplying two numbers together. 

/  For dividing one number by another. 

There are also some other arithmetic operators that we can use:
Operator  Description  Example 

++ 
For incrementing a number (increasing it by 1). 

  For decrementing a number (decreasing it by 1). 

%  Modulus operator (%) returns the division remainder. 

Let's try using the arithmetic operators. Go to the https://makecode.microbit.org website, create a new project and switch from Blocks to JavaScript.
Add the following code examples one by one to your project and see if you get the same result in the simulator.
Add this code  Result 












The + operator can also be used to join (concatenate) strings together.
let firstName = "Stefan"
let lastName = "Jones"
let fullName = firstName + " " + lastName
This will make fullName equal to Stefan Jones.
If you add strings and numbers together then JavaScript will treat the number as a string.
let fname = "Jane"
let age = 25
let x = fname + age
This will make x equal to Jane25.
Let's try using the string operators. Delete all the previous code that you added.
Add the following code examples one by one to your project and see if you get the same result in the simulator.
Add this code  Result 



