How To Calculate Fibonacci Extensions using TypeScript?

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function fibonacci(n: number): number[] {
  let fibonacciSequence: number[] = [0, 1];
  
  for (let i = 2; i < n; i++) {
    fibonacciSequence[i] = fibonacciSequence[i - 1] + fibonacciSequence[i - 2];
  }
  
  return fibonacciSequence;
}

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function fibonacciExtensions(price: number): number[] {
  const fibSequence = fibonacci(15);
  const extensionLevels = [0, 0.618, 1, 1.618, 2.618, 4.236];
  const extensions: number[] = [];

  for (let i = 0; i < extensionLevels.length; i++) {
    extensions.push(price * extensionLevels[i]);
  }

  return extensions;
}

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const price = 100;
const extensions = fibonacciExtensions(price);
console.log(extensions);