In versions 5.6 and later, you can use no warnings 'uninitialized' to suppress that error. In prior versions, you can localize a warnings handler ($SIG{__WARN__}) to suppress that error. Otherwise, you have several options.

• Use a map block to set each element in the array to a null string if it's not defined.
• Skip undefined elements in the loop.
• Turn undefined elements into blank strings within the loop.

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