+ Operator

Microsoft® JScript™
+ Operator

Description

Used to sum two numbers or perform string concatenation.

Syntax

result = expression1 + expression2
The + operator syntax has these parts:

Part Description

result Any variable.

expression1 Any expression.

expression2 Any expression.

Remarks

The underlying subtype of the expressions determines 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.

For information on when a run-time error is generated by the + operator, see the Operator Behavior table.
Prepending "+" to a string will convert a numeric string to a number. toString Method e.g. +"123" returns 123 in numeric form.

file: /Techref/inet/iis/jscript/htm/js618.htm, 3KB, , updated: 2019/3/8 09:55, local time: 2024/11/22 06:18,

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Part	Description
result	Any variable.
expression1	Any expression.
expression2	Any expression.

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.