text: function fibonacci(n) {
      let fib = (() => {
          let f0 = 0, f1 = 1
          return () => {
              let oldf0 = f0, oldf1 = f1
              f0 = oldf1
              f1 = oldf0 + oldf1
              return oldf1
          }
      })()
  
      let fibNumbers = []
      for (let i = 1; i <= n; i++) {
          fibNumbers.push(fib())
      }
      return fibNumbers
  }
  
  console.log(fibonacci(5))