Dict : Accessing items with bracket, like an array or object

[Freddy03h]

For adict{}, we can access a value only by using Dict.get

let d = dict{"A": 5, "B": 6, "C": 7}

let a = d->Dict.get("A")

The goal is to also using a bracket syntax, like with arrays or objects (without removing Dict.get, just like Array.get and Object.get still exist)

let d = dict{"A": 5, "B": 6, "C": 7}

let a = d["A"]

This would allow some bindings to use dict{} instead of {..} while keeping the same ease of access to values.

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The next step could be variable keys but I created this feature request to propose a smaller step that can already be really useful, without having to wait for variable keys.

[cknitt]

The type for

let f = x => x["A"]

would need to keep being inferred as {.."A": 'a} => 'a though, otherwise we break existing code.

So for dict one would need to explicitly annotate

let f = (x: dict<'a>) => x["A"]

This could be a bit confusing to newcomers.

[Freddy03h]

I’m okay with keeping the current inference to avoid breaking existing code.

Explicit annotations can be a bit confusing for newcomers, I agree with that.
But this is already the case in ReScript, for example with unified operators:

let test = (foo, bar) => foo + bar

This always infers to (int, int) => int, and you need to explicitly annotate at least one argument as float if you want.

[cknitt]

Right, this would work pretty much the same way. Not opposed to it.