I made available on youtube a few Perl video tutorials. To watch them, please click the links below:How to use grep to return true or falseHow to use map to find the union of two arraysHow to find the length in bytes of an array of arraysHow to find the length in bytes of a hash of hashesHow to use if with the pattern binding operatorHow to use unless with the exists functionHow to emulate a switch statement in a foreach loopHow to use the foreach loop and @_How to use the for statement to print the keys of a hashHow to print a hash using each and while