Map will return an array, but when you assign it to a hash, all the hash expects is a even-numbered array. So just assign, on each map step, the key/value pair:

%hash = map { my ( $key, $value ) = split ":"; ( $key, $value ) } @arr
+ay;

#OR  

%hash = map { my ( $key, $value ) = split ":"; $key => $value } @array
+;

#OR

%hash = map { split( ":", $_, 2 ) } @array;
[download]

(In the last case, I only want 2 elements from the split, just in case "testkey:extra:colon" might exist.)

-----------------------------------------------------
Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important