JS Tutorials
JS Introduction
JS Syntax
JS Comments
JS Variables
JS Operators
JS Data Types
JS Functions
JS Objects
JS Numbers
JS Arrays
JS Array Methods
JS Booleans
JS Events
JS Strings
JS Dates
JS Maths
JS Objects
Object Definition
Object Properties
Object Methods
Object Display
Object Prototypes
Object Iterables
Object Sets
Object Maps
Object References
JS Functions
Function Definition
Function Parameters
Function Invocation
Function Call
Function Apply
Function ClosuresJS Classes
Class Intro
Class Inhertitance
Class Static
JS Aysnc
JS Callbacks
JS Aysnchronous
JS Prmosies
JS ASync/Await
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JS Operator
Example
Assign values to variables and add them together:
let x = 5; // assign the value 5 to
x
let y = 2; // assign the value
2 to y
let z = x +
y; //
assign the value 7 to z (5 + 2)
The assignment operator (=) assigns a value
to a variable.
Assignment
let x = 10;
The addition operator (+) adds numbers:
Adding
let x = 5;
let y = 2;
let z = x + y;
The multiplication operator (*) multiplies
numbers.
Multiplying
let x = 5;
let y = 2;
let z = x * y;
JavaScript Arithmetic Operators
Arithmetic operators are used to perform arithmetic on numbers:
| Operator | Description |
|---|---|
| + | Addition |
| - | Subtraction |
| * | Multiplication |
| ** | Exponentiation |
| / | Division |
| % | Modulus (Division Remainder) |
| ++ | Increment |
| -- | Decrement |
JavaScript Assignment Operators
Assignment operators assign values to JavaScript variables.
| Operator | Example | Same As |
|---|---|---|
| = | x = y | x = y |
| += | x += y | x = x + y |
| -= | x -= y | x = x - y |
| *= | x *= y | x = x * y |
| /= | x /= y | x = x / y |
| %= | x %= y | x = x % y |
| **= | x **= y | x = x ** y |
The addition assignment operator (+=) adds
a value to a variable.
Assignment
let x = 10;
x += 5;
JavaScript String Operators
The + operator can also be used to add (concatenate)
strings.
Example
let text1 = "John";
let text2 = "Doe";
let text3 = text1 +
" " + text2;
The result of text3 will be:
John Doe
The += assignment operator can also be used to add
(concatenate) strings:
Example
let text1 = "What a very ";
text1 += "nice day";
The result of text1 will be:
What a very nice day
When used on strings, the + operator is called the concatenation operator.
Adding Strings and Numbers
Adding two numbers, will return the sum, but adding a number and a string will return a string:
Example
let x = 5 + 5;
let y = "5" + 5;
let z = "Hello" + 5;
The result of x, y, and z will be:
10
55
Hello5