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Javascript operators

Arithmetic operators

operator	description
+	addition
-	subtraction
*	multiplication
**	exponentiation
/	division
%	modulus
x++	post-increment
x–	post-decrement
++x	pre-increment
–x	pre-decrement

Assignment operators

operator	description
=	Assignment
+=	Addition
-=	substraction
*=	multiplication
/=	division
%=	remainder
**=	exponentiation

Comparison operators

operator	description
==	equal to
===	equal value and type
!=	not equal
!==	not equal value or not equal type
>	greater than
<	less than
>=	greater than or equal to
<=	less than or equal to

Logical operators

operator	description
&&	and
∣∣	or
!	not

In Javascript, logical operator offer more feature than just manipulating boolean values.

∣∣ operator

In this statement, the or operators work as follow.

let value1 = "";                     // false
let value2 = "";                     // false
let value3 = "hello";                //true
result = value1 || value2 || value3; // return value3

• Evaluates operands from left to right.
• Convert each operand to a boolean:
  • If true, it stops and return the original value of that operand.
  • If all operands are false, it return the last one.

&& operator

The and operator work similarly to or, but return a false value.

• Evaluates operands from left to right.
• Convert each operand to a boolean:
  • If false, it stops and return the original value of that operand.
  • If all operands are true, it return the last one.