Arithmetic Operators (+) : Arithmetic operator « Operators « JavaScript Tutorial

All the common arithmetic operators will attempt to convert strings to numbers when applicable.

If a string cannot be converted to a number, NaN (Not A Number) will be returned.

Addition (+)

If the values on either side are numerical values, the values are added together.

IF the values are strings, they are concatenated together.

The following line of code

var resultOfAdd = 34 + 12;

would set the variable resultOfAdd equal to 46

var resultOfAdd = "a" + "b";

would set the variable resultOfAdd equal to the string "ab".

2.1.Arithmetic operator
	2.1.1.	Compound assignment operators
	2.1.2.	Arithmetic Operators (+)
	2.1.3.	Append two strings together
	2.1.4.	Add string and integer together
	2.1.5.	+ (Addition) with data type conversion
	2.1.6.	+= (Addition Assignment)
	2.1.7.	Subtraction (-)
	2.1.8.	Multiplication (*)
	2.1.9.	*= (Multiplication Assignment)
	2.1.10.	Division (/)
	2.1.11.	Working With JavaScript Divide Operators
	2.1.12.	/= (Division Assignment)
	2.1.13.	Arithmetic operator in action
	2.1.14.	Unary Negation
	2.1.15.	String and addition operator (+)

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