Microsoft® JScript™ += Operator | Language Reference Version 1

See Also

##### Description

> Used to increment a variable by a specified amount.

##### Syntax

> result += expression

> The += operator syntax has these parts:

> Part | Description
> result | Any variable.
> expression | Any expression.

##### Remarks

> Using this operator is exactly the same as specifying:

> >     result = result + expression

> 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.

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