Javascript Operators

 

Arithmetic

Operator	Operation	Notes
+	Addition and Concatenation	Concatenation is the combination of strings. "web" + "site" = "website"
-	Subtraction
*	Multiplication
/	Division
%	Modulus (remainder)	d%e; returns the remainder after d is divided by e
++	Increment	a++; is the same as a=a+1;
--	Decrement	a--; is the same as a=a-1;

Assignment

Operator	Operation	Notes
=	Assigns the second value to the first	a = b or "a is assigned the value of b"
+=	Addition assigment	a += b; is the same as a = (a+b);
-=	Subtraction assigment	a -= b; is the same as a = (a-b);
*=	Multiplication assigment	a *= b; is the same as a = (a*b);
/=	Division assigment	a /= b; is the same as a = (a/b);
%=	Modulus assigment	a %= b; is the same as a = (a%b);

Logical - result is "true" or "false"

Operator	Operation	Notes
&&	Logical AND	Returns "true" if BOTH are true
||	Logical OR	Returns "true" if EITHER is true
!	Logical NOT	Toggle - returns "true" if the item is false and "false" if the item is "true".

Comparative - result is "true" or "false"

Operator	Operation	Notes
==	Equality	a = (b == c) a is set to true if b is the same as c, false otherwise
!=	Inequality	a = (b != c) a is set to false if b is the same as c, true otherwise
>	More than	a = (b > c) a is set to true if b is more than c, false otherwise
<	Less than	a = (b < c) a is set to true if b is less than c, false otherwise
>=	More than or equal	a = (b >= c) a is set to true if b is more than equal to c, false otherwise
<=	Less than or equal	a = (b <= c) a is set to true if b is less than equal to c, false otherwise

Conditional

Operator	Operation	Notes
a ? b : c	if a is true do b if a is false do c	var is_ie = browser_id(); ("is_ie") ? alert("Welcome, IE user") : alert("Welcome, non IE user");