Benchmark: timing 10000 iterations of idiomatic, map...
idiomatic:  2 wallclock secs ( 0.89 usr +  0.00 sys =  0.89 CPU) @ 11235.96/s (n=10000)
       map:  3 wallclock secs ( 1.70 usr +  0.00 sys =  1.70 CPU) @ 5882.35/s (n=10000)