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List comprehensions: Difference between revisions
→{{header|Nim}}: Add example using collect()
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=={{header|Nim}}==
There are no list comprehensions in Nim, but thanks to the strong metaprogramming capabilities we can implement our own:▼
List comprehension is done in the standard library with the collect() macro (which uses for-loop macros) from the sugar package:
<lang nim>import sugar, math
let n = 20
let triplets = collect(newSeq):
for x in 1..n:
for y in x..n:
for z in y..n:
if x^2 + y^2 == z^2:
(x,y,z)
echo triplets</lang>
Output:
<pre>@[(3, 4, 5), (5, 12, 13), (6, 8, 10), (8, 15, 17), (9, 12, 15), (12, 16, 20)]</pre>
▲
<lang nim>import macros
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