Instrospection

for "azea".HOW.^attributes { .name.say }


# Candidates
say .signature for @arr.^method_table{'AT-POS'}.candidates;

• FALLBACK is called for methods with unknown name

Dispatch

• Link: https://perl6.party/post/Perl6-But-Heres-My-Dispatch-So-Callwith-Maybe

call____ — call next matching candidate in the chain and come back here next____ — just go to next matching candidate in the chain and don’t come back ____same — use the same arguments as were used for current candidate ____with — make the operation with these new arguments provided samewith — make the same call from scratch, following a new dispatch chain, with these new arguments, and come back

Async

Types

• Native C types

• Custom types

Module

• use loads and imports a module at compile time
• need loads a module at compile time but does not import anything from it
• import imports the names from the loaded module at compile time
• require loads a module at runtime without importing the names

# Reduce
my $sum = reduce { $^a + $^b }, 1..10;
say [+] 1, 2, 3,4;
# -> 10
say [\+] 1, 2, 3, 4;
# -> (1 3 6 10)
say [lt] <a b c d e>;
# -> True


# Map
map { $_ * 2 }, 1..10;
map $num -> { $num * 2 }, 1..10;
map { $^a * 2 }, 1..10;


# Filter
grep { /<[aeiouy]>/ }, @array;
grep {'uno'}, %eng2sp.values;

# Type
my Int @arr = 1...20;

# Shaped arrays
my @arr[12] = 22, 12;
# Fill with Any

say grep { .value == 2 }, %histo.pairs
%seen{$key}:exists
my %uniq = map { $_ => 1 }, @arr;
my %rev = %hash.kv.reverse;