Higher-order functions: Difference between revisions
→{{header|Picat}}
m (→{{header|Quackery}}: added some more commentary) |
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Line 3,393:
$result = first(function() { return 'second'; });</lang>
=={{header|Picat}}==
<lang Picat>go =>
L = 1..10,
L2 = 1..3,
% map
println(map(f1,L)),
println(map($f2(3),L)),
println(map(f2,L,map(f1,L))),
% List comprehension.
% This is the recommended approach.
println([f1(I) : I in L]),
println([[I,J,f2(I,J)] : I in L, J in L2]),
% apply
println(apply(+,1,2)),
println(apply(f2,10,22)),
% sort function
S = [
"rosetta code",
"adam",
"eve",
"picat",
"pattern-matching",
"imperative",
"constraints",
"actors",
"tabling"
],
println(map(len,S)),
println(S.qsort(sortf)), % sort on length
nl.
f1(X) = X**2.
f2(X,A) = X**A + A**X.
%
% qsort(List, SortFunction)
% returns a sorted list according to the sort function SortFunction
%
qsort([],_F) = [].
qsort([H|T],F) = qsort([E : E in T, call(F,E,H)], F)
++ [H] ++
qsort([E : E in T, not call(F,E,H)],F).
% sort on length
sortf(F1,F2) =>
F1.length < F2.length.</lang>
Output:
<pre>[1,4,9,16,25,36,49,64,81,100]
[4,17,54,145,368,945,2530,7073,20412,60049]
[2,32,20412,4295032832,298023223886718750,10314424798490535548348731392,256923577521058878088611477224913844394456,6277101735386680763835789423207666416102355725939011223552,196627050475552913618075908526912116283103450944214766927315565632601688195930,10000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000000]
[1,4,9,16,25,36,49,64,81,100]
[[1,1,2],[1,2,3],[1,3,4],[2,1,3],[2,2,8],[2,3,17],[3,1,4],[3,2,17],[3,3,54],[4,1,5],[4,2,32],[4,3,145],[5,1,6],[5,2,57],[5,3,368],[6,1,7],[6,2,100],[6,3,945],[7,1,8],[7,2,177],[7,3,2530],[8,1,9],[8,2,320],[8,3,7073],[9,1,10],[9,2,593],[9,3,20412],[10,1,11],[10,2,1124],[10,3,60049]]
3
10000000026559922791424
[12,4,3,5,16,10,11,6,7]
[eve,adam,picat,actors,tabling,imperative,constraints,rosetta code,pattern-matching]</pre>
=={{header|PicoLisp}}==
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