const assert = require("assert")

const fibonacci_rec = function(n) {
    assert.ok(Number.isInteger(n), "n is not an Integer!")
    if(n == 0) {
        return 0
    } else if (n == 1) {
        return 1
    } else {
        return fibonacci_rec(n - 1) + fibonacci_rec(n - 2)
    }
}

const fibonacci_opt = function(n) {
    const g = function(n) {
        return (1 + Math.sqrt(5)) / 2
    }
    assert.ok(Number.isInteger(n), "n is not an Integer!")
    if(n == 0) {
        return 0
    } else if (n == 1) {
        return 1
    } else {
        
    }
}