Addition Operator (+) (JavaScript)

Adds the value of one numeric expression to another, or concatenates two strings.

Syntax


result = expression1 + expression2  

Parameters

result
Any variable.

expression1
Any expression.

expression2
Any expression.

Remarks

The types of the two expressions determine the behavior of the + operator.

If Then
Both expressions are numeric or Boolean Add
Both expressions are strings Concatenate
One expression is numeric and the other is a string Concatenate

Requirements

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

See Also

Addition Assignment Operator (+=)
Operator Precedence
Operator Summary (JavaScript)