carlinmack/ArraysAndHashes.md

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Perl Arrays and Hashes

Raw

    
Creation
Reference
Dereference

Array
@array = ()
$ref = []

@array = ('one', two)

$value = $array[$index];

$ref = ['one', 'two']
$value = $ref->[$index];

@array[0] = 'one'
$ref->[0] = 'one'

$ref = \@foo
@new_array = @{$ref}

Hash
%hash = ()
$ref = {}

%hash = (key => 'value')

$value = $hash{key}

$ref = {key => 'value'}
$value = $ref->{key}

$hash{key} = 'value'
$ref->{key} = "value"

$ref = \%hash
%new_hash = %{$ref}

	Creation	Reference	Dereference
Array	@array = ()	$ref = []
	@array = ('one', two)		$value = $array[$index];
		$ref = ['one', 'two']	$value = $ref->[$index];
	@array[0] = 'one'	$ref->[0] = 'one'
		$ref = \@foo	@new_array = @{$ref}
Hash	%hash = ()	$ref = {}
	%hash = (key => 'value')		$value = $hash{key}
		$ref = {key => 'value'}	$value = $ref->{key}
	$hash{key} = 'value'	$ref->{key} = "value"
		$ref = \%hash	%new_hash = %{$ref}