function arrayMaximalAdjacentDifference(nums) {
    //  write code here.
   
   let result = 0;
   for (let i = 0; i < nums.length-1 ; i++){
       const diff = compareVals(nums[i], nums[i+1]);
       diff > result? result = diff : false;
   }
   
   function compareVals(a, b){
       return Math.abs(a - b);
   }
   
   return result;
}



/**
* 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);
    });
});