How to Count Fibonacci Sequence in JavaScript?

function fibonacciSequence() {
 const sumOfLastTwo = ar => ar.slice(-2).reduce((a,v) => a + v, 0);

 let fib = [0, 1];
 while (sumOfLastTwo(fib) < 255) { fib.push(sumOfLastTwo(fib)); }
 return fib;
}

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