JSFiddle - React, Tailwind, and code Playground

JavaScript

var sequences = {
    fib: function(n){
        if(n === 1) return 0;
        if(n === 2) return 1;
        return sequences.fib(n-1) + sequences.fib(n-2);
    }
}

var fibonacci = sequences.fib;
sequences = {}

console.log(fibonacci(30));