Perl updating hash of arrays dating dealbreakers video games
my @sandwich = ( ' PB', ' J' ); my @other_sandwich = ( ' B', ' L', ' T' ); my @ingredients = ( @other_sandwich, @sandwich ); # ( ' B', ' L', ' T', ' PB', ' J' ) This means you can't have an array "contain" another array, or a hash. One of the greatest features of Perl is the ability to have an extra comma at the end of a list.
For example: my @a = qw(Steve Stu Stan); $a = [' Stewart', ' Zane']; # @a = (' Steve', ARRAY(0x841214c), ' Stan') # Memory address to an array reference my @a = qw(Steve Stu Stan); my @b = qw(Stewart Zane); $a = @b; # @a = (' Steve', 2, ' Stan') # Returns a scalar reference, the length of @b); second, we define the offset (how far into the list we want the splice to start); third, we specify the length of the splice (how far forward from the offset we'll be deleting to make room for the new list); finally, we list the items we want inserted.
They are simple, fast, and they usually "just work," so people never need to know or care about how they are implemented.
Sometimes, though, it's interesting and rewarding to look at familiar tools in a different light.
This command will declare an empty hash: In the code above, Perl takes the first entry in the list as a key (‘monday’), and the second entry as that key’s value (65).
The third entry in the list (‘tuesday’) would then be declared as a key, and the fourth entry (68) as its value and so on.
A hash is an unsorted collection of key value pairs.
In Perl, array and hash members must be a single value.