Hi Pat,
>What is the meaning of thro?
>I have seen it here and there but never quite understood its purpose.
>
>Regards
>Patrick
>
>
>----- Original Message -----
>From: "Ladislav Mecir"
>
>
>
>>yes, it is useful. The following improvement uses the [throw] attribute
>>to make the behaviour of the function more standard with respect to
>>
>>
>Return:
>
>
>>trif: func [
>> {Three case if}
>> [throw]
>> condition
>> iftrue [block!]
>> iffalse [block!]
>> ifnone [block!]
>>] [
>> do either condition [
>> iftrue
>> ] [
>> either none? condition [
>> ifnone
>> ] [
>> iffalse
>> ]
>> ]
>>]
>>
>>; example:
>>
>>f: does [trif request "give an answer" [return "yes"] [return "no"]
>>
>>
>[return "cancel"] "Shoudn't get here"]
>
>
Try to use the version of the above function without the [throw]
attribute and you will find out, that the result of F will be:
== "Shoudn't get here"
, which indicates, that the Return got "consumed" by Trif , while what
we intended was to "throw" Return to F. The "throw" attribute does
exactly that - throws Return to caller functions.
Merry Christmas
-Ladislav
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