Fibonacci approaching Golden Ratio

Fibonacci Ratio

var _ = require('lodash');

// Helper function for generating the nth Fibonacci number
var fibonacci = _.memoize(function(n) {
    return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);
});

var fibonacci_ratio = function(n) {
    return fibonacci(n) / fibonacci(n - 1);
};

_.times(20, function(n) {
    console.log(fibonacci_ratio(n));
});