Brackets in Perl

For beginners, the usage of different types of brackets might be confusing. When to use curly brackets '{}', round brackets '()' or square brackets '[]'? After reading this post, you will be pretty clear.

Round brackets '()'

1. initialize array or hash

my %hash = ('key' => 'value' );
my @array = (1,4,5,6);

Curly brackets '{}'

1. access to hash values.

my %hash = ('key' => 'value' );
print $hash{'key'};

2. anonymous hash

my $hash = { 'key' => 'value' };

Square brackets '[]'

1. access elements of arrays.

my @array = (1,4,5,6);
print $array[3];