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  1. or download this
    @a = map {
    # A function of $_, eg:
    $_ . ".txt"
} @a;
  2. or download this
    # Emulate grep with map
@a = map { elementShouldBeIncluded($_) ? $_ : () } @a;

# Double up the list
@a = map { ($_, $_) } @a;
  3. or download this
    @a = map {
    # Is it a dir?
...
        # It's a file - pass it straight through
        $_
} @a;