Variable deletion from command line

[Hadrien Theveneau]

Hi,

Is there a way to delete a variable from the command line ? If not, maybe we should implement it ?

Have a nice day, Hadrien

[Helder Correia]

No. I've considered adding a del(symbol) function in the past.

[Tey']

It shouldn't be that hard to implement. Should we?

[Pol Welter]

may I suggest a different syntax? Namely del symbol. This would differentiate it from the usual functions.

[Tey']

FWIW, unset sounds better to me. Implementing it as a builtin function is easier, but I'm not against a new keyword. We should make sure it is not part of an expression though (e.g., unset var1 + 2 or 2 + unset var1 should fail), which might be easier to do with a keyword.

[Helder Correia]

I like unset. Still not sure about the "simplified syntax" nature of it.

[Pol Welter]

My idea was to clearly differentiate it from the ordinary functions (that return a value) from these commands that affect the application.

Other commands that I have in mind:

• clear, or clear history
• clear functions
• clear variables
• set angleMode radians

Those are just ideas, I dunno.

We'd probably best send the input through some sort of special command parser, rather than have this integrated into the evaluator.

[Helder Correia]

Maybe prefix commands with : Vim-style.