[OT] Re: Andrei's list of barriers to D adoption

[Adam D. Ruppe via Digitalmars-d]

On Friday, 10 June 2016 at 15:03:30 UTC, jmh530 wrote:
> Let's say you have something simple like 1+2, you would build 
> an AST that looks something like
>    +
>   / \
>  1   2
> What would be the next step?

https://github.com/adamdruppe/arsd/blob/master/script.d#L879

The function is pretty simple: interpret the left hand side (here 
it is 1, so it yields int(1)), interpret the right hand side 
(yields int(2)), combine them with the operator ("+") and return 
the result.

Notice that interpreting the left hand side is a recursive call 
to the interpret function - it can be arbitrarily complex, and 
the recursion will go all the way down, then all the way back up 
to get the value.