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Basic JavaScript

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JS References

JavaScript Objects


JavaScript Operators

Operators are for Mathematical and Logical Computations

The Assignment Operator = assigns values

The Addition Operator + adds values

The Multiplication Operator * multiplies values

The Comparison Operator > compares values


JavaScript Assignment

The Assignment Operator (=) assigns a value to a variable:

Assignment Examples

let x = 10;
Try it Yourself »
// Assign the value 5 to x
let x = 5;
// Assign the value 2 to y
let y = 2;
// Assign the value x + y to z:
let z = x + y;
Try it Yourself »

JavaScript Addition

The Addition Operator (+) adds numbers:

Adding

let x = 5;
let y = 2;
let z = x + y;
Try it Yourself »

JavaScript Multiplication

The Multiplication Operator (*) multiplies numbers:

Multiplying

let x = 5;
let y = 2;
let z = x * y;
Try it Yourself »

Types of JavaScript Operators

There are different types of JavaScript operators:

  • Arithmetic Operators
  • Assignment Operators
  • Comparison Operators
  • Logical Operators
  • And more ...

JavaScript Arithmetic Operators

Arithmetic Operators are used to perform arithmetic on numbers:

Arithmetic Operators Example

let a = 3;
let x = (100 + 50) * a;
Try it Yourself »
Operator Description
+ Addition
- Subtraction
* Multiplication
** Exponentiation
/ Division
% Modulus (Division Remainder)
++ Increment
-- Decrement

Note

Arithmetic operators are fully described in the JS Arithmetic chapter.

JavaScript String Addition

The + can also be used to add (concatenate) strings:

Example

let text1 = "John";
let text2 = "Doe";
let text3 = text1 + " " + text2;
Try it Yourself »

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
Try it Yourself »

Note

When used on strings, the + operator is called the concatenation operator.


Adding Strings and Numbers

Adding two numbers, will return the sum as a number like 5 + 5 = 10.

Adding a number and a string, will return the sum as a concatenated string like 5 + "5" = "55".

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
Try it Yourself »

Note

If you add a number and a string, the result will be a string!



JavaScript Assignment Operators

Assignment operators assign values to JavaScript variables.

The Addition Assignment Operator (+=) adds a value to a variable.

Assignment

let x = 10;
x += 5;
Try it Yourself »
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

Note

Assignment operators are fully described in the JS Assignment chapter.


JavaScript Comparison Operators

Comparison operators are used to compare two values.

Comparison operators always return true or false.

Example

let x = 5;
let result = x > 8;
Try it Yourself »
Operator Description Example
== equal to x == 5
=== equal value and equal type x === 5
!= not equal x != 5
!== not equal value or not equal type x !== 5
> greater than x > 5
< less than x < 5
>= greater than or equal to x >= 5
<= less than or equal to x <= 5

All the comparison operators above can also be used on strings:

Example

let text1 = "A";
let text2 = "B";
let result = text1 < text2;
Try it Yourself »

Note that strings are compared alphabetically.

Note

Comparison operators are fully described in the JS Comparisons chapter.


JavaScript Logical Operators

Operator Description
&& logical and
|| logical or
! logical not

Note

Logical operators are fully described in the JS Logical chapter.



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