JavaScript operators table.

An operator is used to transform one (unary) or two (binary) values into a single resultant value. The values are the operands. The combination of the operator and its operands is the expression.

For basic examples start from JavaScript: Basics

Also see JavaScript: Strings and JavaScript: Maths for further examples and expressions.

Operator	Precedence	Associativity	Type of operand	Brief description
.	15	left-to-right	object	access a property or method (dot notation)
[]	15	left-to-right	array	array indexing
()	15	left-to-right	function arguments	calls to a function
new	15	right-to-left	call to object constructor	creates a new object
++	14	right-to-left	value	increment
--	14	right-to-left	value	decrement
-	14	right-to-left	number	unary minus or negative number
+	14	right-to-left	number	unary plus or positive number
!	14	right-to-left	boolean	logical NOT
typeof	14	right-to-left	any type	returns data type
delete	14	right-to-left	value	deletes a custom object property, method, or array element
void	14	right-to-left	any type	returns 'undefined' value
*	13	left-to-right	numbers	multiplication
/	13	left-to-right	numbers	division
%	13	left-to-right	numbers	modulus
+	12	left-to-right	numbers	addition
-	12	left-to-right	numbers	subtraction
+	12	left-to-right	strings	concatenation
<	10	left-to-right	numbers, strings	less than
<=	10	left-to-right	numbers, strings	less than or equal to
>	10	left-to-right	numbers, strings	greater than
>=	10	left-to-right	numbers, strings	greater than or equal to
==	9	left-to-right	any type	test for equality
!=	9	left-to-right	any type	test for inequality
&&	5	left-to-right	booleans	logical AND
\|\|	4	left-to-right	booleans	logical OR
=	2	right-to-left	value, any type	assignment
+=	2	right-to-left	value, any type	operation and assignment, example: sVar+=tVar is equivalent to: sVar=sVar+tVar

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