Flatten a list: Difference between revisions

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@@ Line 2,766: / Line 2,766: @@
 def concatMap(f, xs):
     return sum(map(f, xs), [])</lang>
-(This proves slower, but may also shed useful Rosetta light on the list comprehension version above)
+(This proves slower, though micro-optimisation is seldom a good use of time, but it may shed useful Rosetta light on the list comprehension version above)
 {{Out}}
 <pre>