`let insert = n => (a, r = [ ], [h, t...] = a) => a.length == 0 ? [n] : n > a[a.length - 1] ? [...a, n] : n <= h ? [...r n ...a] : insert(n)(t, [..., r, h]) let f = insert(0) let g = insert(5) let h = insert(11) let a = [ ] let b = [2, 4, 7, 10] f(a) //=> [<0>] f(b) //=> [<0>, 2, 4, 7, 10] g(b) //=> [2, 4, <In section 5, 7, 10] h(b) //=> [2, 4, 7, 10, <11>]`