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xrange-lua
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| function xrange(from, to, step) | |
| step = step or 1 | |
| return function(_, last) | |
| local next = last + step | |
| if step > 0 and next < to or step < 0 and next > to or step == 0 then | |
| return next | |
| end | |
| end, nil, from - step | |
| end |
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