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I keep seeing -> in code and I am not exactly sure what it means. For example:
@top_links = @{$m->links}; What does this line do? Also, where can I maybe read about it?
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It is used with a pointer variable pointing to a structure or union. The arrow operator is formed by using a minus sign, followed by the greater than symbol as shown below. Operation: The -> operator in C or C++ gives the value held by variable_name to structure or union variable pointer_name.
The most commonly used special variable is $_, which contains the default input and pattern-searching string. For example, in the following lines − #!/usr/bin/perl foreach ('hickory','dickory','doc') { print $_; print "\n"; }
The ++ and -- operators are used with a variable to increment or decrement that variable by 1 (that is, to add or subtract 1). And as with C, both operators can be used either in prefix fashion (before the variable, ++$x) or in postfix (after the variable, $x++).
See The Arrow Operator in perlop:
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->" is an infix dereference operator, just as it is in C and C++. If the right side is either a[...],{...}, or a(...)subscript, then the left side must be either a hard or symbolic reference to an array, a hash, or a subroutine respectively. (Or technically speaking, a location capable of holding a hard reference, if it's an array or hash reference being used for assignment.) See perlreftut and perlref.Otherwise, the right side is a method name or a simple scalar variable containing either the method name or a subroutine reference, and the left side must be either an object (a blessed reference) or a class name (that is, a package name). See perlobj.
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