I had a situation where I needed to scan through a list of numbers, and find the list index of the number that is just less than my target number.
Code: Select all
(set 'foo '(1 5 10 20 100 105)) (dotimes (i (+ -1 (length foo)) (> (foo i) 50)) (foo i)) => true ;; was expecting return value of 20 (last value before triggering break condition)
Also, is there a better idiom to do such scanning, some sort of binary search function?
I understand it is useful to know whether the break condition was triggered or not, couldn't that be saved in a system variable $brk the way regex output is? Also, even leaving $idx behind after a form evaluation would be nice too.