Perl what is the difference between or and

So its function is to ensure the Perl version of the module invocation environment. Our, like my , is a declaration of variables.

But our declares package global variables. My declares lexical variables. However, with our declared variable, it becomes like a lexical variable. In fact, this is also our purpose: to deceive strict pragma and make strict think it is a lexical variable, but it is not. There is a simple way to understand our: 1.

You treat our declared variable as my declared variable. Keep in mind the difference between our and my: our declaration is a package global variable, so it can be stored in the symbol table which can be accessed anywhere with full restriction , while my declaration is a real lexical variable that can only be accessed in closed blocks.

Perl, unlike other languages, can declare variables at will. By Priya Pedamkar. Perl is a dynamic, high level and general-purpose programming language where it is not having any official acronym such as Practical Extraction and Reporting Language and few others without any standard forms. Perl was first released in the year , which was 30 years ago. The latest stable release version of Perl is 5. It was purely developed and implemented using a C programming language. It is having a pure dynamic type of discipline.

It was designed by the author Larry Wall. It supports the cross-platform operating system. It was licensed under GNU general public license. It has different filename extensions such as. It has flexibility and powerful features to be used in many applications. PHP is called as Hypertext Pre-processor, which is a type of server-side scripting language.

It was developed and designed for web development purposes. An array in scalar context returns its length. A hash returns its number of buckets. Every Perl construct or operator that can be used in an expression does well defined, but sometimes different, things in scalar or list context. See List is a Four-Letter Word. And, it sounds like you didn't read the Camel book very closely. I'd suggest you take the time and re read it. Then there are Damian modules You can assign a list to both an array and a hash and they do what you mean, but that doesn't make either of them lists..

You can copy them to another list, create new lists from parts of the original, etc. But you can't change the list. Arrays are true variables - you shift off the front, push onto the back, splice out of the middle - change it anyway you want.

So operations that modify the length of a 'list' require an array. The camel book says you can think of an array as a variable and a list as its values. Note that you can assign to an element of a list e.