diff options
| -rwxr-xr-x | thinkperl6/draft.p6 | 86 |
1 files changed, 84 insertions, 2 deletions
diff --git a/thinkperl6/draft.p6 b/thinkperl6/draft.p6 index a8add76..ade0c28 100755 --- a/thinkperl6/draft.p6 +++ b/thinkperl6/draft.p6 @@ -1,6 +1,7 @@ #!/usr/bin/env perl6 # Exercise 2.2.1 -sub sphere-volume($r) { 4/3 * π * $r³ } +sub sphere-volume(Numeric(Cool) $r) { 4/3 * π * $r³ } +#put sphere-volume('5'); # Exercise 3.1 # Notice the operator precedence @@ -90,7 +91,7 @@ sub ducks { map * ~ 'ack' , flat('J'..'N', 'Ou', 'P', 'Qu') } sub count(Str $string, Str $substr, Int $index = 0, Int $result = 0) { my $i = index $string, $substr, $index; - return $result if $i === Any; + return $result unless defined $i; count $string, $substr, $i + 1, $result + 1 } #put count 'banana', 'na'; @@ -129,3 +130,84 @@ sub insert-sort(@seq is copy) { @seq } #put insert-sort <4 2 6 5 3 9 1>; + +# Some simple regexes +#put $/ if "π ≈ $(π)" ~~ /\d**10/; +#put $/ if '1234567890' ~~ /^ <[0..7]>+ $/; +#put $/ if ' Hello, World!' ~~ /\w+/; +#put $/ if 'qaz asdf zxcv' ~~ /<< a \w*/; +#put $/ if 'hmmm ooer' ~~ /<< <[aeiou]> \w*/; +#put $/ if '0621323 0612345678- 0701234567' ~~ /<< 0 <[67]> \d**8 >>/; +#put $/ if 'hMmM OoEr' ~~ /:i << <[aeiou]> \w*/; +#put $/ if 'hmmm ooer' ~~ /(\w)$0/; +#put $1 if 'hmmm ooer' ~~ /(\w) $0 .* ((\w) $0)/; + +sub YYYY-MM-DD(Str $string) { + "$0-$1-$2" if $string ~~ /<< (\d\d\d\d) \- (\d\d) \- (\d\d) >> + <?{0 < $1 < 13 && $2 && ($1 - 2 && $2 < 31 + ($1 - 1)%7%%2 || + $2 < 29 + $0%%400 + ($0%100)*($0%%4))}>/ +} +#put YYYY-MM-DD '986-05-19-1700-02-29-1234-11-31-01-10-2000-02-29'; + +# Exercise 7.3 +sub rotate-ascii(Str $string, Int $rotation) { + $string.comb.map({ m/<[A..Z]>/ && chr(65 + ($/.ord + $rotation - 65)%26) || + m/<[a..z]>/ && chr(97 + ($/.ord + $rotation - 97)%26) || + $_ }).join +} +#put rotate-ascii 'cheer', 7; +#put rotate-ascii 'melon', -10; +#put rotate-ascii 'HAL', 1; + +# Exercise 8.1 +#put $_ if $_.chars > 20 for '/usr/share/dict/words'.IO.lines; + +# Exercise 8.2 +sub words(&predicate) { grep &predicate, '/usr/share/dict/words'.IO.lines } +#put $_ for words({ not /<[Ee]>/ }); + +# Exercise 8.3 +multi avoids(@letters, @forbidden) { ($_ ∉ @letters for @forbidden).all } +multi avoids(Str $word, Str $forbidden) { avoids $word.comb, $forbidden.comb } +sub least-forbidden(Int $n) { + my %avoids = [$_ => {} for 'a'..'z']; + for '/usr/share/dict/words'.IO.lines.map(~*.lc).Set.keys -> $word { + %avoids{$_}{$word} = True unless defined index $word, $_ for 'a'..'z'; + } + + # Despacito (baby take it slow so we can last long) + [([∩] %avoids{$_}).elems => $_ for combinations('a'..'z', $n)].max.value +} +# Unless run on a supercomputer, there ain't no way +# one has the patience to wait for it to finish. +#say least-forbidden 5; + +# Exercise 8.4 +my $uses-only = <a c e f h l o>.Set; +#put words -> $word { ($_ ∈ $uses-only for $word.comb).all }; + +# Exercise 8.5 +my @uses-all = <a e i o u y>; +#put words -> $word { (defined index $word, $_ for @uses-all).all }; + +# Exercise 8.6 +multi is-abcdedarian(@word) { @word ~~ @word.sort } +multi is-abcdedarian(Str $word) { is-abcdedarian $word.lc.comb } +#put words &is-abcdedarian; + +# Exercise 8.7 +#put words { m/(.) $0 (.) $1 (.) $2/ }; + +# Exercise 8.8 +#.put if [substr($_, 2), substr($_ + 1, 1), substr($_ + 2, 1, 4), ~($_ + 4)] +# .map(&is-palindrome).all for 100_000..999_996 + +# Exercise 8.9 +sub age-reversible(Int $times) { + for '10'..'90' -> $car { + my $diff = $car - $car.flip; + my @reversible = grep { $_.flip == $_ - $diff }, $car..'99'; + return @reversible if @reversible.elems == $times + } +} +#put age-reversible(8)[*-3].flip; |