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comp.lang.lisp

Re: better way to enumerate

William James

1/7/2016 9:48:00 AM

Kaz Kylheku wrote:

> (defun enumerate-with-op-iter (start end &aux elist)
> (loop
> ;; test terminating condition, return result
> (when (> start end)
> (return (reverse elist)))
> ;; update variables for next iteration
> (psetf
> start (1+ start)
> elist (cons start elist)))))

MatzLisp (Ruby):

The hard way:

def number_sequence low, high
result = []
while low <= high
result << low
low += 1
end
result
end

The easy way:

(low .. high).to_a

Another way:

low.upto(high).to_a

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