Function: do()

Evaluates a number of Expressions in sequence and returns the value returned by the last Expression in the list.

Syntax

do(expression1, expression2[,..., expressionN])

Note that if a break() or continue() function is used within the do() then the do() function returns immediately and since it has not reached the last expression in the list a _NULL value will be returned.

Examples

do(
   //evaluate an expression
   $number = 1,
   
   //and then evaluate another expression
   $word = "Word"
)

This whole do() block evaluates to the value of the last expression: "Word"

Note that $number and $word are still available after the do() statement has been concluded.

do( 
   $difference = crm.total - billing.total, 
   
   if( $difference != 0, 
      addElement( $errors, "difference in totals") 
   ),
 
   $difference
)

The first expression in the list calculates the difference between a total from the CRM system and a corresponding total from the Billing system and then assigns this difference to the $-Variable $difference.

The second expression checks if this value is non-zero (i.e. that there is a difference) and if so adds an error message to the $-Variable $errors which will be an Array containing one or more error messages.

The last expression will evaluate to the value returned by the do() function. Since this is simply the $-Variable $difference this value will be returned.

Note in the above example, the values of $difference and $errors will be available for subsequent Attribute Expressions on the same Stream.

See Also

• Functions