JS Fibonacci

fibonacci.js

function fibonacci(n) {
  
  var last = 0, next = 0, fibo = [];

  while( n-- > 0 ) {
    fibo.push(next);
    next = last + (last = next) || 1; 
  }

  return fibo;
  
}

console.log(fibonacci(0));
console.log(fibonacci(1));
console.log(fibonacci(2));
console.log(fibonacci(3));
console.log(fibonacci(10));

Output:

[]
[0]
[0, 1]
[0, 1, 1]
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]