function arrayMaximalAdjacentDifference(nums) {
    let maxDifference = 0;
    let diff;

    for (let i = 0; i < nums.length - 1; i++) {
      diff = Math.abs(nums[i] - nums [i + 1])
      // Test if difference is largest
      if (diff > maxDifference) {
        maxDifference = diff; 
      }
    }
    return maxDifference;
}



/**
* Test Suite 
*/
describe('arrayMaximalAdjacentDifference()', () => {
    it('returns largest difference between adjacent values', () => {
        // arrange
        const nums = [2, 4, 1, 0];
        
        // act
        const result = arrayMaximalAdjacentDifference(nums);

        // log
        console.log("result 1: ", result);
        
        // assert
        expect(result).toBe(3);
    });

    it('returns largest difference between adjacent values example 2', () => {
        // arrange
        const nums = [2, 9, 1, 0];
        
        // act
        const result = arrayMaximalAdjacentDifference(nums);

        // log
        console.log("result 2: ", result);
        
        // assert
        expect(result).toBe(8);
    });
});