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perl6 Array of hashes AoH

by teun-arno (Acolyte)
on Mar 19, 2018 at 19:26 UTC ( #1211264=CUFP: print w/replies, xml ) Need Help??

Perl5 has array of hashes ( AoH ) this can be done in perl6 also :

D:\perl6.scripts\myown>perl6 -v This is Rakudo Star version 2018.01 built on MoarVM version 2018.01 implementing Perl 6.c.

I am on windows10

use v6; # create 3 hashes, showing mixed inits that can be used in perl6 : my %hsh0 = ( "Name" => "George H. W. Bush", "Function" => <president o +f USA> , 'Time' => <2001-2009>); my %hsh1 = ( "Name" => "Bill Clinton", "Function" => <president of USA +> , 'Time' => <1993-2001>) ; my %hsh2 = ( "Name" , "Barack Obama", "Function" , <President of USA +> , 'Time' , <2009-2017> ) ; # Subscript Adverbs : :exists :k :v :p :delete #if ( %hsh1<Name>:exists) { # Use this when keys have No Spaces !! my $key = 'Name' ; if ( %hsh1{$key}:k) { # Can I use %hsh1{Name}:exists : Yes works! say "Found Name element in %hsh1"; } # there is an other use for <> construct : , but {} also works!! say %hsh1{}:v.perl; #Show all values say %hsh1.pairs.perl; # push the several hashes onto the array : @arr my @arr ; # Please notice the : after the push @arr.push: { %hsh0 } ; @arr.push: { %hsh1 } ; @arr.push: { %hsh2 } ; # show some entries. using serveral formats that perl6 has : say '@arr.[0].{"Name"} = ' ~ @arr.[0].{'Name'}; say '@arr.[1].<Name> = ' ~ @arr.[1].<Name> ; say @arr.end.fmt('%+4d') ; # How many items ( hashes ) are in the ar +ray. # dump @arr dd @arr; # try looping over the @arr , and detect the keys stored in the hash. +It's more simple than I thought ( after some experimenting ) for 0 .. @arr.end -> $idx { say "@arr idx : $idx"; my %x = @arr[$idx]; for %x.kv -> $key, $value { printf "%10.10s : %-20.20s\n" , $key, $value; # please notice +printf NOT using () ; } }

Output

D:\perl6.scripts\myown>perl6 array_hash_3.p6 Found Name element in %hsh1 ($("president", "of", "USA"), "1993-2001", "Bill Clinton") (:Function($("president", "of", "USA")), :Time("1993-2001"), :Name("Bi +ll Clinton")).Seq @arr.[0].{"Name"} = George H. W. Bush @arr.[1].<Name> = Bill Clinton +2 Array @arr = [{:Function($("president", "of", "USA")), :Name("George H +. W. Bush"), :Time("2001-2009")}, {:Function($("president", "of", "US +A")), :Name("Bill Clinton"), :Time("1993-2001")}, {:Function($("Presi +dent", "of", "USA")), :Name("Barack Obama"), :Time("2009-2017")}] @arr idx : 0 Function : president of USA Time : 2001-2009 Name : George H. W. Bush @arr idx : 1 Function : president of USA Time : 1993-2001 Name : Bill Clinton @arr idx : 2 Function : President of USA Time : 2009-2017 Name : Barack Obama

Could not find any usefull examples on this subject : This is what I came up with.
Hope it's usefull for somebody else.

 have fun with Perl6

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