What is the difference between use and require in perl

Please Turn OFF your ad blocker. Learn More. Home Interview Questions Programming Perl. What is difference between "Use" and "require".

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Remember, 'perl' is an interpreter , not compiler. Use : 1. The method is used only for the modules only to include. The included objects are verified at the time of compilation. No Need to give file extension. We have learned about modules and how to load them to memory , but I have not explained the difference between use and require , and you probably have seen use in most places and I have only explained about require in the previous episode.

Download: mp4 ogv webm require We saw require Math::Calc; when the script is running and it reaches the above expression, it will go over the directories listed in the INC array, check if any of them has a subdirectory called Math and if that subdirectory there is a file called Calc.

When it finds the fist such file, it loads it into memory, compiles it and stops the search. This will let you use the functions of the module with their fully qualified name eg. Math::Calc::add use If you have either of these expressions in the code: use Math::Calc; use Math::Calc qw add ; then perl will load and compile the module during the compilation time of the script. So during the compilation for phase, when perl finished compiling the code in the BEGIN-block, it will pause the compilation and execute the code inside the block.

The second statement in the BEGIN runs the import method of the newly loaded module if there is such a method.