Type.ListOf

[kwijibo]

It would be useful to be able to define that a property of a type should be a typed list, eg:

const Shape = Type({Shape: [ListOf(Point)]})

Implementation could be something like (assuming the prototype version in the next branch)

Type.ListOf = type => list => R.all(R.is(type), list)

[paldepind]

Great idea. union-type allows one to use any validator function. So it should be possible to just define ListOf and use it like this

var ListOf = type => list => R.all(R.is(type), list)
const Shape = Type({Shape: [ListOf(Point)]})

[kwijibo]

Unfortunately this still doesn't work:
TypeError: Expecting a function in instanceof check, but got #<Object>
https://tonicdev.com/56d99860c541640d00a08d12/56e9228c007e791100e3d56a

[kwijibo]

Is ListOf a common enough modelling requirement that it would be worth adding the function to the library?

[jgoux]

I'd be very interested in this type too ! 👍