Eh, I've a hard time believe there exists a situation where it [statically splicing the code, as in cog's solution] wouldn't work, but where it's still possible to dynamically splicing in code blocks while code is running.

Could you give an example of such code?

BTW, what you are asking for is a special case of "loop enlightment", and cog's solution is the standard way of solving this. It belongs in Programming 102.

In reply to Re^3: Doing "it" only once by Anonymous Monk
in thread Doing "it" only once by Limbic~Region

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