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use v6;
use Test;
# L<S32::Containers/"List"/"=item grep">
=begin pod
built-in grep tests
=end pod
plan 44;
my @list = (1 .. 10);
{
my @result = grep { ($_ % 2) }, @list;
is(+@result, 5, 'we got a list back');
is(@result[0], 1, 'got the value we expected');
is(@result[1], 3, 'got the value we expected');
is(@result[2], 5, 'got the value we expected');
is(@result[3], 7, 'got the value we expected');
is(@result[4], 9, 'got the value we expected');
}
#?rakudo skip "adverbial block RT #124755"
{
my @result = @list.grep():{ ($_ % 2) };
is(+@result, 5, 'we got a list back');
is(@result[0], 1, 'got the value we expected');
is(@result[1], 3, 'got the value we expected');
is(@result[2], 5, 'got the value we expected');
is(@result[3], 7, 'got the value we expected');
is(@result[4], 9, 'got the value we expected');
}
#?rakudo skip "adverbial block RT #124756"
{
my @result = @list.grep :{ ($_ % 2) };
is(+@result, 5, 'we got a list back');
is(@result[0], 1, 'got the value we expected');
is(@result[1], 3, 'got the value we expected');
is(@result[2], 5, 'got the value we expected');
is(@result[3], 7, 'got the value we expected');
is(@result[4], 9, 'got the value we expected');
}
{
is(42.grep({ 1 }), "42", "method form of grep works on numbers");
is('str'.grep({ 1 }), 'str', "method form of grep works on strings");
}
#
# Grep with mutating block
#
# L<S02/Names/"$_, $!, and $/ are context<rw> by default">
{
my @array = <a b c d>;
is ~(@array.grep({ $_ ~= "c"; 1 })), "ac bc cc dc",
'mutating $_ in grep works (1)';
is ~@array, "ac bc cc dc",
'mutating $_ in grep works (2)';
}
# grep with last, next etc.
{
is (1..16).grep({last if $_ % 5 == 0; $_ % 2 == 0}).join('|'),
'2|4', 'last works in grep';
is (1..12).grep({next if $_ % 5 == 0; $_ % 2 == 0}).join('|'),
'2|4|6|8|12', 'next works in grep';
# RT #130365
is (^Inf).grep({last if $_ > 5; True}).eager.join, '012345',
'last in grep on infinite list';
# RT #130529
{
my $retries = 0;
is (1..5).grep({
if $_ == 3 {
$retries++;
redo unless $retries == 3
};
$_
}).join('|'), '1|2|3|4|5', 'redo works in grep (1)';
is $retries, 3, 'redo works in grep (2)';
}
}
# since the test argument to .grep is a Matcher, we can also
# check type constraints:
{
is (2, [], 4, [], 5).grep(Int).join(','),
'2,4,5', ".grep with non-Code matcher";
is grep(Int, 2, [], 4, [], 5).join(','),
'2,4,5', "grep() with non-Code matcher";
}
# RT #71544
{
my @in = ( 1, 1, 2, 3, 4, 4 );
# This test passes, but it's disabled because it doesn't belong here.
# It just kind of clarifies the test that follows.
# is (map { $^a == $^b }, @in), (?1, ?0, ?1), 'map takes two at a time';
is (grep { $^a == $^b }, @in), (1, 1, 4, 4), 'grep takes two at a time';
}
{
my @a = <a b c>;
my @b = <b c d>;
is @a.grep(any(@b)).join('|'), 'b|c', 'Junction matcher';
}
# sensible boolification
# RT #74056
# since rakudo returns an iterator (and not a list) and some internals leaked,
# a zero item list/iterator would return True, which is obviously wrong
{
ok <0 1 2>.grep(1), 'Non-empty return value from grep is true (1)';
ok <0 1 2>.grep(0), 'Non-empty return value from grep is true (2)';
nok <0 1 2>.grep(3), 'Empty return value from grep is false';
}
# chained greps
{
is ~(1...100).grep(* %% 2).grep(* %% 3), ~(6, 12 ... 96), "chained greps work";
}
# Bool handling
{
temp $_ = 42;
throws-like { grep $_ == 1, 1,2,3 }, X::Match::Bool;
throws-like { (1,2,3).grep: $_== 1 }, X::Match::Bool;
is grep( Bool,True,False,Int ), (True,False), 'can we match on Bool as type';
is (True,False,Int).grep(Bool), (True,False), 'can we match on Bool as type';
}
# RT #118755
{
my @a = 1..10;
@a.grep(* %% 2).>>++;
is @a, <1 3 3 5 5 7 7 9 9 11>,
'grep is rw-like, can chain it to modify elements of grepped list/array';
}
# RT #128773
{
is (^∞).grep(*.is-prime).is-lazy, True, '.grep propagates .is-lazy';
is (grep *.is-prime, ^∞).is-lazy, True, 'grep() propagates .is-lazy';
}
# grep with an unexpected adverb
{
throws-like(
{ @list.grep(Mu, :asdf) },
X::Adverb,
message => q{Unexpected adverb 'asdf' passed to grep on @list},
'grep on an instance with an unexpected adverb'
);
throws-like(
{ List.grep(Mu, :asdf) },
X::Adverb,
message => q{Unexpected adverb 'asdf' passed to grep on List},
'grep on a type object with an unexpected adverb'
);
}
# vim: ft=perl6