Hi RChristiansen,
you wrote:
>This doesn't work...
>
>month: to-string now/month
>if (length? month < 2) [insert month "0"]
>
>** Script Error: Expected one of: string! - not: integer!.
>** Where: if (length? month < 2) [insert month "0"]
Try:
>> if (length? month) < 2 [insert month "0"]
== "5"
>How come?
Since you ask:
1. < is polymorph:
String comparison:
>> "1" < "2"
== true
When the left argument to < is of type string, < expects the right argument
to be of type string as well.
2. Precedence:
The < is evaluated first, then the length? operator. Example:
>> "123" < "1234"
== true
>> length? "123" < "1234"
** Script Error: length? expected series argument of type: series port tuple.
** Where: length? "123" < "1234"
What's the complaint? First "123" < "1234" is evaluated and returns true.
Then length? is applied to true. We are applying length? here to a boolean
value.
Accordingly, this does not work:
>> length? "123" < 10
** Script Error: Expected one of: string! - not: integer!.
** Where: length? "123" < 10
Precedence, < is applied before length? Polymorphism, < detects that its
left argument is a string, and therefore expects the right argument to be a
string as well.
But this does work, because we force length? to be applied first and <
detects an integer left and expects an integer as its right argument:
>> (length? "123") < 10
== true
;- Elan >> [: - )]
