"Avoid needless slurping. Use while (<DATA>) instead of introducing an extra variable, slurping into it and using a for loop."

The OP (suno) is using a for loop to read through data in the @Read_Array array - that's a variable suno already has, not an extra variable.

No indication is given of how that array is populated.

my @Read_Array = <DATA>; (in my code) initialises @Read_Array with the data shown.

suno's question is not about how to capture the data; it's about how to process it once it's in @Read_Array.

Finally, suno specifically says "... without using while loop ...". I don't know why that is requirement: perhaps addressing your data capture comments to suno would be more appropriate.