/* Test a function which takes another function as an argument */
let foobar = (i: int): int => {
  let foo: int => int = (i: int) => i;

  let bar: ((int => int) => int) = (f: (int => int)) => f(i);

  bar(foo);
};

/* higher order function with more than one argument */
let higher2 = (i: int, f: (int => int)): int => {
  let ii: int = f(i);
  ii;
};

let foobar2 = (i: int): int => {
  let foo2: int => int = (i: int) => i;

  higher2(i, foo2);
};

let a: int = 0;

let foobar3 = (i: int): int => {
  let foo2: int => int = (i: int) => a + i;

  higher2(i, foo2);
};

let f = (i: int): int => i;

let g = (i: int): int => f(i);

let foobar4 = (i: int): int => g(g(i));

let higher3 = (i: int, f: (int => int), g: (int => int)): int => {
  let ii: int = f(g(i));
  ii;
};

let foobar5 = (i: int): int => {
  let a: int = 0;
  let foo: int => int = (i: int) => a + i;

  let goo: int => int = (i: int) => foo(i);

  higher3(i, foo, goo);
};