Introduction to the usage of 5-perl hash in the Age of small

Basic usage # initialize % H as an empty array % H ={}; # use an array to initialize % H as a => 1, B => 2% H = ('A', 1, 'B', 2); % H = ('A' => 1, 'B' => 2); # If the key is a string, % H = (a => 1, B => 2) can be omitted. # Use {} to access print "$ H {A} n "; # Print $ H {B} = '2b '; print "$ H {B} n"; # print 2B # delete key using delete $ H {B }; # Delete 'B' from $ h to clear Perl hash UNDEF % H; obtain all hash key values # obtain all keys. The order depends on the hash function, or @ all_keys = keys % H; # all key values are sorted in descending order by hash value. Value Comparison is numeric comparison (for example, 10> 9) @ all_keys = sort {$ H {$ B }=>h H {$ A} (Keys % H ); determine whether Perl hash contains key exists ($ H {$ key }); perl hash length $ hash_size = keys % H # Put % H in $ hash_size print scalar keys % H, "N"; # print the length of % H. Scalar is used to return the array length. Traverse a Perl hash while (My ($ K, $ v) = each % H) {print "$ K ---> $ VN ";} reference reference is similar to the C/C ++ pointer $ h_ref = % H; # Get a hash reference, % ahash =%{$ h_ref }; # use Hash reference as hash with $ value = $ h_ref-> {akey }; # This is the same as % H {akey} for transferring Perl hash to the function. Generally, a reference is passed to the function % H = (); $ H {A} = 1; foo (% H); print $ H {B}, "N"; # print 2. This value is from function Foo () sub Foo {My ($ h) [email protected] _; print $ H-> {A}, "N "; # print out the 1 $ H-> {B} = 2;} function to return hash, or hash reference sub Foo {My % FH; $ FH {A} = 1; return % H;} My % H = Foo (); print "$ H {A} n "; # print out 1, but it is equivalent to copying the entire hash from % FH to % H, which is less efficient. You can consider returning the hash reference: Sub Foo {My % FH; $ FH {A} = 1; return % FH;} My $ hR = Foo (); print "$ HR-> {A} n"; # print out 1.my % H = % {Foo ()} # This method can be used if you want to copy the file. Do not worry that % FH in sub foo is a local variable. Perl automatically manages the memory. It will find that % FH is referenced by $ HR, and the memory of % FH will not be cleared, and the memory will be released after $ HR becomes invalid.

 

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Introduction to the usage of 5-perl hash in the Age of small