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Higher-order functions take other functions as arguments. The fun part: you must not inline the call unless the target is constant - otherwise you break semantics (and your VM). #kotlin

What exactly is the “order” of a function? Is it a number? Who is number 1? Are you number 6?

A first order function takes parameters, a second order function takes a function as a parameter, a third order function takes a function that takes a function as a parameter, and so on

What about this Python function, then: def f(g) : return g What order does f(f) return?

Essentially, functions in Python are just one big "function" type, and because the order of a function depends on its parameters, and parameter types can change in Python, it's impossible to know. For example, what would the order of this function be?

def f(g): pass f(lambda: print("hi")) f(lambda x: print(x))