Bool
Bool ( expression ) : Boolean
| Parameter | Type | Description | |
|---|---|---|---|
| expression | Expression | → | Expression for which to return the boolean form |
| Function result | Boolean | ← | Boolean form of the expression |
Description
The Bool command returns the boolean form of the expression you passed in expression.
The command can return the following values, depending on the expression result type:
| Expression result type | Return of the Bool command |
|---|---|
| Undefined | False |
| Null | False |
| Boolean | False if false, otherwise True |
| Number | False if 0, other True |
| Other types | False |
This command is useful when the code expects a boolean value, and when the evaluation of the expression could result in a different type (e.g. if it evaluates to null or undefined).
Example
You select a value depending on the contents of an object field attribute, anticipating the case where the attribute is missing:
var $married : Text
$married:=Choose(Bool([Person]data.married);"Married";"Single")
//"Single" if the "married" attribute is not found in the field
ALERT("This person is "+$married)