Couldn’t you make this safer by passing the map something that’s not a plain JS function? I confess to that being the only thing that had me questioning the logic. If I can express everything, then everything should work. If it’s not going to work, I don’t want to be able to express it.

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kentonv 4 days ago | parent [-]

I think any other syntax would likely be cumbersome. What we actually want to express here is function-shaped: you have a parameter, and then you want to substitute it into one or more RPC calls, and then compute a result. If you're going to represent that with a bunch of data structures, you end up with a DSL-in-JSON type of thing and it's going to be unwieldy.

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pcthrowaway 4 days ago | parent [-]

I suspect there is prior work to draw from that could make this feasible for you... Have a look at how something like MongoDB handles conditional logic for example.

	▲	kentonv 3 days ago \| parent [-]
		Yeah that's what I mean by DSL-in-JSON. I think it's pretty clunky. It's also (at least in Mongo's formulation, at least when I last used it ~10 years ago) very vulnerable to query injection.