Benchmark: timing 1000 iterations of Foreach, Map...
   Foreach: 54 wallclock secs (49.54 usr +  0.12 sys = 49.66CPU) @ 20.14/s (n=1000)
       Map: 31 wallclock secs (28.80 usr +  0.06 sys = 28.86CPU) @ 34.65/s (n=1000)