Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

177 lines (136 sloc) 5.723 kb
use v6;
use Test;
plan 57;
=begin description
This test tests the C<pick> builtin. See S32::Containers#pick.
Previous discussions about pick.
L<"http://groups.google.com/group/perl.perl6.language/tree/browse_frm/thread/24e369fba3ed626e/4e893cad1016ed94?rnum=1&_done=%2Fgroup%2Fperl.perl6.language%2Fbrowse_frm%2Fthread%2F24e369fba3ed626e%2F6e6a2aad1dcc879d%3F#doc_2ed48e2376511fe3">
=end description
# L<S32::Containers/List/=item pick>
my @array = <a b c d>;
ok ?(@array.pick eq any <a b c d>), "pick works on arrays";
#?niecza skip '().pick === Nil'
ok ().pick === Nil, '.pick on the empty list is Nil';
my @arr = <z z z>;
ok ~(@arr.pick(2)) eq 'z z', 'method pick with $num < +@values';
ok ~(@arr.pick(4)) eq 'z z z', 'method pick with $num > +@values';
is pick(2, @arr), <z z>, 'sub pick with $num < +@values, implicit no-replace';
is pick(4, @arr), <z z z>, 'sub pick with $num > +@values';
is (<a b c d>.pick(*).sort).Str, 'a b c d', 'pick(*) returns all the items in the array (but maybe not in order)';
{
my @items = <1 2 3 4>;
my @shuffled_items_10;
push @shuffled_items_10, @items.pick(*) for ^10;
isnt(@shuffled_items_10, @items xx 10,
'pick(*) returned the items of the array in a random order');
}
{
# Test that List.pick doesn't flatten array refs
ok ?([[1, 2], [3, 4]].pick.join('|') eq any('1|2', '3|4')), '[[1,2],[3,4]].pick does not flatten';
ok ?(~([[1, 2], [3, 4]].pick(*)) eq '1 2 3 4' | '3 4 1 2'), '[[1,2],[3,4]].pick(*) does not flatten';
}
{
ok <5 5>.pick() == 5,
'.pick() returns something can be used as single scalar';
}
{
my @a = 1..100;
my @b = pick(*, @a);
is @b.elems, 100, "pick(*, @a) returns the correct number of elements";
is ~@b.sort, ~(1..100), "pick(*, @a) returns the correct elements";
is ~@b.grep(Int).elems, 100, "pick(*, @a) returns Ints (if @a is Ints)";
}
{
my @a = 1..100;
isa_ok @a.pick, Int, "picking a single element from an array of Ints produces an Int";
ok @a.pick ~~ 1..100, "picking a single element from an array of Ints produces one of them";
isa_ok @a.pick(1), Int, "picking 1 from an array of Ints produces an Int";
ok @a.pick(1) ~~ 1..100, "picking 1 from an array of Ints produces one of them";
my @c = @a.pick(2);
isa_ok @c[0], Int, "picking 2 from an array of Ints produces an Int...";
isa_ok @c[1], Int, "... and an Int";
ok (@c[0] ~~ 1..100) && (@c[1] ~~ 1..100), "picking 2 from an array of Ints produces two of them";
ok @c[0] != @c[1], "picking 2 from an array of Ints produces two distinct results";
is @a.pick("25").elems, 25, ".pick works Str arguments";
is pick("25", @a).elems, 25, "pick works Str arguments";
}
{
#?rakudo todo 'error on pick :replace'
dies_ok({ [1,2,3].pick(4, :replace) }, 'error on deprecated :replace');
}
# enums + pick
{
is Bool.pick(*).grep(Bool).elems, 2, 'Bool.pick works';
enum A <b c d>;
is A.pick(*).grep(A).elems, 3, 'RandomEnum.pick works';
}
# ranges + pick
{
my %seen;
%seen{$_} = 1 for (1..100).pick(50);
is %seen.keys.elems, 50, 'Range.pick produces uniq elems';
ok (so 1 <= all(%seen.keys) <= 100), '... and all the elements are in range';
}
{
my %seen;
%seen{$_} = 1 for (1..300).pick(50);
is %seen.keys.elems, 50, 'Range.pick produces uniq elems';
ok (so 1 <= all(%seen.keys) <= 300), '... and all the elements are in range';
}
{
my %seen;
%seen{$_} = 1 for (1..50).pick(*);
is %seen.keys.elems, 50, 'Range.pick produces uniq elems';
ok (so 1 <= all(%seen.keys) <= 50), '... and all the elements are in range';
}
{
ok 1 <= (1..50).pick <= 50, 'Range.pick() works';
}
{
my %seen;
%seen{$_} = 1 for (1..1_000_000).pick(50);
is %seen.keys.elems, 50, 'Range.pick produces uniq elems';
ok (so 1 <= all(%seen.keys) <= 1_000_000), '... and all the elements are in range';
}
{
my %seen;
%seen{$_} = 1 for (1^..1_000_000).pick(50);
is %seen.keys.elems, 50, 'Range.pick produces uniq elems (lower exclusive)';
ok (so 1 < all(%seen.keys) <= 1_000_000), '... and all the elements are in range';
}
{
my %seen;
%seen{$_} = 1 for (1..^1_000_000).pick(50);
is %seen.keys.elems, 50, 'Range.pick produces uniq elems (upper exclusive)';
ok (so 1 <= all(%seen.keys) < 1_000_000), '... and all the elements are in range';
}
{
my %seen;
%seen{$_} = 1 for (1^..^1_000_000).pick(50);
is %seen.keys.elems, 50, 'Range.pick produces uniq elems (both exclusive)';
ok (so 1 < all(%seen.keys) < 1_000_000), '... and all the elements are in range';
}
{
my %seen;
%seen{$_} = 1 for (1 .. (10**1000) ).pick(50);
is %seen.keys.elems, 50, 'Range.pick produces uniq elems in huge range';
ok (so 1 <= all(%seen.keys) <= 10**1000), '... and all the elements are in range';
}
is (1..^2).pick, 1, 'pick on 1-elem range';
ok ('a'..'z').pick ~~ /\w/, 'Range.pick on non-Int range';
# RT #109586
nok ([==] (^2**64).roll(10).map(* +& 15)), 'Range.pick has enough entropy';
# sanity on Enums
{
is Order.pick, any(Less,Same,More), 'simple pick on Enum type works';
is Order.pick(1), any(Less,Same,More), 'one pick on Enum type works';
is sort(Order.pick(*)), (Less,Same,More), 'all pick on Enum type works';
is sort(Order.pick(4)), (Less,Same,More), 'too many pick on Enum type works';
is Order.pick(0), (), 'zero pick on Enum type works';
is Less.pick, Less, 'simple pick on Enum is sane';
is Same.pick(1), Same, 'one pick on Enum is sane';
is More.pick(*), More, 'all pick on Enum is sane';
is Less.pick(4), Less, 'too many pick on Enum is sane';
is More.pick(0), (), 'zero pick on Enum is sane';
}
# vim: ft=perl6
Jump to Line
Something went wrong with that request. Please try again.