Print n-th value of fibonaci series or Print the whole fibonacci series til n-th value using recursive function in Javascript

fibonacciUsingRecursion.js

// if you want whole fibonacci series till n
let fibb = [0, 1];
function fibonacciTillN(n) {
  if (fibb[n - 1] != undefined) {
    return fibb[n - 1];
  } else {
    return (fibb[n - 1] = fibonacciTillN(n - 1) + fibonacciTillN(n - 2));
  }
}
fibonacciTillN(10);
console.log(fibb);
// Output:
// [0, 1, 1, 2, 3, 5, 8, 13, 21, 34];


// if you want to access any item, 
//just call it with index, 
//let assume you need 54th fibbonacci number
fibonacciTillN(100);
console.log(fibb[54]);
// Output:
// 86267571272