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Defined function (traditional): Difference between revisions
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Defined function (traditional) (view source)
Revision as of 07:28, 25 June 2021
, 07:28, 25 June 2021→Shyness
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</source> | </source> | ||
{{Works in|[[Dyalog APL]], [[APL2]], [[GNU APL]], [[NARS2000]], [[APLX]], and every older APL from [[APL\360]]}} | {{Works in|[[Dyalog APL]], [[APL2]], [[GNU APL]], [[NARS2000]], [[APLX]], and every older APL from [[APL\360]]}} | ||
=== Semi-colons === | |||
Assignments are global by default. To keep a name local, it must be mentioned in the header, separated from the rest of the header by a semi-colon: | |||
<source lang=apl> | |||
∇ r←l Tradfn r;intermediate | |||
intermediate←l r | |||
r←intermediate intermediate | |||
∇ | |||
</source> | |||
{{Works in|[[Dyalog APL]], [[APL2]], [[GNU APL]], [[NARS2000]], [[APLX]], and every older APL from [[APL\360]]}} | |||
=== Braces === | === Braces === | ||
An [[ambivalent function]] with an optional left argument, a conditional [[control structure]], one local variable, and a [[#Shyness|shy]] result: | An [[ambivalent function]] with an optional left argument, a conditional [[control structure]], one local variable, and a [[#Shyness|shy]] result: | ||
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==== Shyness ==== | ==== Shyness ==== | ||
By default, functions in APL will print their result to the session log even without using <source lang=apl inline>⎕←</source> unless their results are shy. Shy results are declared by putting curly braces around the result name (for example <source lang=apl inline>{result}←left Function right</source>). Assignment (<source lang=apl inline>name←array</source>) exhibits the same behaviour as a shy function in that, by default, no result is printed when the function terminates, but attempting to use the result still succeeds. | |||
==== Namelists ==== | ==== Namelists ==== | ||