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Comment by goplayoutside | Hacker News Reader

I've been using an app called Calctape[0] for years that sounds similar to what you're describing.

It's essentially a 4-function calculator that records every step on tape, but you can edit any digit anywhere and all related steps are immediately recalculated, like on a spreadsheet.

[0] https://calctape.app/

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Interesting. Not exactly what I described though (sorry I did not explain very well.) What I meant, you type 2 calculations:

Then if you tap the first line ("1+1") my ideal REPL would add it to the bottom:

  > 1+1
  2
  > 10+10
  20
  > 1+1_ (with the cursor here ready to edit it)

Then you can for examlpe change a 1 to 2, then type ENTER:

That way you can easily compute a few things, then compare both the expressions and results of the last few calculations, and quickly make edits/corrections as needed.

I've been using All-In-One Calculator (https://play.google.com/store/apps/details?id=all.in.one.cal...) for years, mostly because of all the conversions it can do. It has what you want, although you need to clear the result before tapping a previous calculation, otherwise it appends the formula to the result (e.g. in your example, you would get 201+1).

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