Use ES6 generator to generate infinite fibonacci series

javascript_generator_fibonacci.js

function *calcFib () { 
  let n = 0 
  
  let fib = function(v) { 
    return v <= 1 ? v : fib(v - 1) + fib(v - 2) 
  } 

  while (true) yield fib(n++)
}

let generator = calcFib()

generator.next() // 0
generator.next() // 1
generator.next() // 1
generator.next() // ...