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If you are just looking for a simple function that gets the nth Fibonacci number, you can use phi:

$$\frac{\sqrt5 + 1}2$$

To calculate the nth fibonacci number:

$$fib(n)=round(\phi^n/\sqrt5)$$

I don't know javascript very well, but if you can store the value of phi and square root of 5, you can do:

var SQRT_5 = Math.sqrt(5); var PHI = (SQRT_5 + 1) / 2; var yourself = { fibonacci : function(n) { if (n === 0) { return 0; } if (n === 1) {  return 1;  } return Math.round(Math.pow(PHI, n) / SQRT_5); } }; 

If you are just looking for a simple function that gets the nth Fibonacci number, you can use phi:

$$\frac{\sqrt5 + 1}2$$

To calculate the nth fibonacci number:

$$fib(n)=round(\phi^n/\sqrt5)$$

I don't know javascript very well, but if you can store the value of phi and square root of 5, you can do:

var SQRT_5 = Math.sqrt(5); var PHI = (SQRT_5 + 1) / 2; var yourself = { fibonacci : function(n) { if (n <= 1) { return n; } return Math.round(Math.pow(PHI, n) / SQRT_5); } }; 

If you are just looking for a simple function that gets the nth Fibonacci number, you can use phi:

$$\frac{\sqrt5 + 1}2$$

To calculate the nth fibonacci number:

$$fib(n)=round(\phi^n/\sqrt5)$$

I don't know javascript very well, but if you can store the value of phi and square root of 5, you can do:

var yourself = { var SQRT_5 = Math.sqrt(5);  var PHI = (SQRT_5 + 1) / 2; fibonacci : function(n) {   if (n === 0) { return 0; } if (n === 1) { return 1; } return Math.round(Math.pow(PHI, n) / SQRT_5); } }; 

If you are just looking for a simple function that gets the nth Fibonacci number, you can use phi:

$$\frac{\sqrt5 + 1}2$$

To calculate the nth fibonacci number:

$$fib(n)=round(\phi^n/\sqrt5)$$

I don't know javascript very well, but if you can store the value of phi and square root of 5, you can do:

var SQRT_5 = Math.sqrt(5); var PHI = (SQRT_5 + 1) / 2; var yourself = {  fibonacci : function(n) { if (n === 0) { return 0; } if (n === 1) { return 1; } return Math.round(Math.pow(PHI, n) / SQRT_5); } }; 

If you are just looking for a simple function that gets the nth Fibonacci number, you can use phi:

$$\frac{\sqrt5 + 1}2$$

To calculate the nth fibonacci number:

$$fib(n)=round(\phi^n/\sqrt5)$$

I don't know javascript very well, but if you can store the value of phi and square root of 5, you can do:

var yourself = { fibonacci : function(n) { const SQRT_5 = Math.sqrt(5);   const PHI = (SQRT_5 + 1) / 2; if (n === 0) { return 0; } if (n === 1) { return 1; } return Math.round(Math.pow(PHI, n) / SQRT_5); } }; 

If you are just looking for a simple function that gets the nth Fibonacci number, you can use phi:

$$\frac{\sqrt5 + 1}2$$

To calculate the nth fibonacci number:

$$fib(n)=round(\phi^n/\sqrt5)$$

I don't know javascript very well, but if you can store the value of phi and square root of 5, you can do:

var yourself = { var SQRT_5 = Math.sqrt(5); var PHI = (SQRT_5 + 1) / 2; fibonacci : function(n) { if (n === 0) { return 0; } if (n === 1) { return 1; } return Math.round(Math.pow(PHI, n) / SQRT_5); } };