Question

Let’s say I have

WORLD: make object! [
      people: make Object! []
      cars: make Object! []
      factories: make Object! []
      create: func[][print "new world"]
]

How can I chain with the create method? something like this doesn’t work.

(make WORLD[])/create

This is the JavaScript I would like to emulate

(new WORLD()).create()

Answer 1

The idiom in this case is do get in:

>> do get in make object! [a: does [42]] 'a
== 42

IN returns the word 'a in the object’s context. GET retrieves the value bound to 'a word (in that context). Finally as we expected the value returned by GET to be a function, we just call that function using DO.

For your example given, this would therefore look as follows:

do get in make WORLD [] 'create

As per Hostile Fork’s suggestion in the comments, here is a fully parenthesised version of the last expression, to make function arity explicit:

do (get (in (make WORLD []) 'create))