Yes, we can look at an object as a function that accepts a key and returns a value (or null). Depends on language, it's called a set, map, or associative list.

  type AnObject = {
    [key: any]: any
  }

  type FunkyObject = (key: any) => Maybe<any>

Then we can see arrays as a limited type of object/function that only accepts a number (index) as key.

  type FunkyList = (index: number) => Maybe<any>

We can even consider any variable as a function whose key is the name.

  type FunkyVariable = (name: string) => Maybe<any>

And any operation as a function whose key is the operator, with arguments, and the return value is the result.

  type FunkyOperator = (name: string, ...values: any) => any

  FunkyOperator('+', 1, 2) // => 3

Even an `if` statement can be a function, as long as the values are functions that return values instead of the values themselves, to allow for "short-circuiting" (latter values are unevaluated if an earlier value is true).

So we approach some kind of functional language land where all data structures are modeled using functions.