reverse - flip a string or a list

- NAME
- SYNOPSIS
- DESCRIPTION

# NAME

reverse - flip a string or a list

# SYNOPSIS

reverse LIST

# DESCRIPTION

In list context, returns a list value consisting of the elements of LIST in the opposite order. In scalar context, concatenates the elements of LIST and returns a string value with all characters in the opposite order.

        print reverse <>;           # line tac, last line first

        undef $/;                   # for efficiency of <>
        print scalar reverse <>;    # character tac, last line tsrif

Used without arguments in scalar context, `reverse()` reverses `$_`.

This operator is also handy for inverting a hash, although there are some caveats. If a value is duplicated in the original hash, only one of those can be represented as a key in the inverted hash. Also, this has to unwind one hash and build a whole new one, which may take some time on a large hash, such as from a DBM file.

        %by_name = reverse %by_address;     # Invert the hash

reverse - flip a string or a list