function adjacentElementsProduct(nums) {
  let largestProduct = nums[0] * nums[1];
  for (let i = 1; i < nums.length - 1; i++) {
    const adjacentProduct = nums[i] * nums[i + 1];
    if (largestProduct < adjacentProduct) {
      largestProduct = adjacentProduct;
    }
  }
  return largestProduct;
}



/**
* Test Suite 
*/
describe('adjacentElementsProduct()', () => {
    it('returns largest product of adjacent values', () => {
        // arrange
        const nums = [3, 6, -2, -5, 7, 3];
        
        // act
        const result = adjacentElementsProduct(nums);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(21);
    });
});