function arrayMaximalAdjacentDifference(nums) {
    var maxDiff = 0
    nums.forEach((item, index) => {
        if(Math.abs(item - nums[index+1]) > maxDiff){
            maxDiff = Math.abs(item - nums[index+1])
        }
    } )
    
    return maxDiff
}



/**
* 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);
    });
    
     it('returns largest difference between adjacent values example 3', () => {
        // arrange
        const nums = [0];
        
        // act
        const result = arrayMaximalAdjacentDifference(nums);

        // log
        console.log("result 3: ", result);
        
        // assert
        expect(result).toBe(0);
    });
    
    it('returns largest difference between adjacent values example 4', () => {
        // arrange
        const nums = [-1,-2,-4,-6,-8];
        
        // act
        const result = arrayMaximalAdjacentDifference(nums);

        // log
        console.log("result 4: ", result);
        
        // assert
        expect(result).toBe(2);
    });
    
     it('returns largest difference between adjacent values example 5', () => {
        // arrange
        const nums = [-1,0];
        
        // act
        const result = arrayMaximalAdjacentDifference(nums);

        // log
        console.log("result 5: ", result);
        
        // assert
        expect(result).toBe(1);
    });
    
    it('returns largest difference between adjacent values example 6', () => {
        const nums = [-5, 2, 3, 4, 1, -3]
        const result = arrayMaximalAdjacentDifference(nums)
        console.log("result 6: ", result)
        expect(result).toBe(7)
    })
    
    it('returns largest difference between adjacent values example 7', () => {
        const nums = [8, 12, 32, 11, -4]
        const result = arrayMaximalAdjacentDifference(nums)
        console.log("result 7: ", result)
        expect(result).toBe(21)
    })
});