mock array comprehension
for(var o=([1,2,3,4,5,6,7,8,9,10]),z=(o.length-1), r=[]; r[z]=o[z] * 5 ; --z ) r[z]+=5 // ==[10,15,20,25,30,35,40,45,50,55]
for(var o=([1,2,3,4,5,6,7,8,9,10]),z=(o.length-1), r=[]; r[z]=o[z] * 5 ; --z ) r[z]+=5 // ==[10,15,20,25,30,35,40,45,50,55]