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| function* range(...args) { | |
| let start, stop, step | |
| if (args.length === 0) return | |
| if (args.length === 1) | |
| start = 0, stop = args[0], step=1 | |
| else | |
| [start, stop, step = 1] = args | |
| for (let i = start; step > 0 ? i < stop : i > stop; i += step) | |
| yield i | |
| } |
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