If I understand your problem correctly (adding values of "same" keys) , your map ² works as expected!

  DB<107> \%result 
 => { key1 => 2, key140 => 1, key15 => 4, key150 => 1 }

[download]

If you still believe its wrong please show working code¹ and point out whats missing.

Cheers Rolf

(addicted to the Perl Programming Language)

¹) there is at least one = missing

²) Well this (keys %muthash,keys %copyhash) will produce overhead cause it's not a unique list, anyway map still works.)

In reply to Re: Merging two hashes, keeping keys unique but adding values if necessary by LanX
in thread Merging two hashes, keeping keys unique but adding values if necessary by Majestic

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