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Array length

my @array = <apple orange banana>;
 
say @array.elems;  # 3
say elems @array;  # 3
say +@array;       # 3
say @array + 1;    # 4

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String length
https://rosettacode.org/wiki/String_length#Perl_6

Byte Length

say 'møøse'.encode('UTF-8').bytes;

Character Length

say 'møøse'.codes;

Grapheme Length

say 'møøse'.chars;