Benchmark: timing 10000 iterations of idiomatic, map...
 idiomatic:  1 wallclock secs ( 1.25 usr +  0.00 sys =  1.25 CPU) @ 8012.82/s (n=10000)
       map:  3 wallclock secs ( 2.31 usr +  0.00 sys =  2.31 CPU) @ 4330.88/s (n=10000)