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Closures/Value capture: Difference between revisions
→{{header|Factor}}: "Forget the variable!" Add a version that uses fried quotations.
m (→{{header|Factor}}: Move a comment.) |
(→{{header|Factor}}: "Forget the variable!" Add a version that uses fried quotations.) |
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=={{header|Factor}}==
===Using lexical variables===
<lang factor>USING: io kernel locals math
[let
! Create a sequence of
10 iota [
:> i
[ i i * ]
] map :> seq
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The wrong way would use <code>f :> i! 10 iota [ i! [ i i * ] ] map :> seq</code> to mutate a single binding. Then the program would print, "3 squared is 81", "8 squared is 81".
===Using fried quotations===
Forget the variable! Each ''fried quotation'' captures some values by pulling them from the stack.
<lang factor>USING: fry io kernel math prettyprint sequences ;
! Push a sequence of 10 quotations
10 iota [
'[ _ dup * ] ! Push a quotation ( i -- i*i )
] map
{ 3 8 } [
dup pprint " squared is " write
over nth call .
] each
drop</lang>
=={{header|Fantom}}==
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