Fibonacci Sequence Generator

fibonacciGenerator.js

/**
 * Fibonacci Sequence Generator
 * @example
 * // returns array with 10 numbers in sequence
 * fibonacciGenerator(10);
 * @param {number} n - Amount of numbers to return
 * @returns {array} Fibonacci Sequence
 **/
function fibonacciGenerator(n) {
  if (n === 0 || n === undefined) {
    return [];
  }
  if (n === 1) {
    return [0];
  }

  let sequence = [0,1];

  for (let i = 3; i <= n; i++) {
    let sequenceSize = sequence.length;
    let a = sequence[sequenceSize - 2];
    let b = sequence[sequenceSize - 1];
    sequence.push(a + b);
  }

  return sequence;
}