JavaScript Operators

Arithmetic Operators

Operator	Description	Example	Result
+	Addition	2+2	4
-	Subtraction	5-2	3
*	Multiplication	4*5	20
/	Division	15/5 5/2	3 2.5
%	Modulus. Returns the remainder after the first divisionExample 1: 5/2 results in 2, remainder 1 Example 2: 10/8 results in 1, remainder 2	5%2 10%8	1 2
++	Increment	x=5 x++	x=6
--	Decrement	x=5 x--	x=4

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Comparison Operators

Operator	Description	Example
==	is equal to	5==8 returns false
!=	is not equal	5!=8 returns true
>	is greater than	5>8 returns false
<	is less than	5<8 returns true
>=	is greater than or equal to	5>=8 returns false
<=	is less than or equal to	5<=8 returns true

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Assignment Shorthand Operators

Operator	Example	Is The Same As
+=	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

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Logical Operators

Operator	Description	Example
&&	and	x=6 y=3(x < 10 && y > 1) returns true
||	or	x=6 y=3(x==5 || y==5) returns false
!	not	x=6 y=3x != y returns true

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String Operator

A string is most often a text, for example "Hello World!". To stick two or more string variables together, use the + operator.

txt1="What a very" txt2="nice day!" txt3=txt1+txt2

The variable txt3 now contains "What a verynice day!".

To add a space between two string variables, insert a space into the expression, OR in one of the strings.

txt1="What a very" txt2="nice day!" txt3=txt1+" "+txt2 or txt1="What a very " txt2="nice day!" txt3=txt1+txt2

The variable txt3 now contains "What a very nice day!".