nthFibonacci
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const nthFibonacci = (n) => {
const v5 = Math.sqrt(5)
const Phi = (v5 + 1) / 2
const phi = Phi - 1
return Math.round(
Math.pow(Phi, n) / v5 - Math.pow(-phi, n) / v5)
};
console.log(nthFibonacci(6));
// function fibonacci_nth(i){
// var v5 = Math.sqrt(5),
// Phi = ( v5 + 1 ) / 2,
// phi = Phi-1;
// return Math.round( Math.pow(Phi, i) / v5 - Math.pow(-phi, i) / v5 );
// }
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