// option 1
const arrayMaximalAdjacentDifference=(nums)=>Math.max(...nums.map((num,index)=>num - nums[index +1]>0? Math.abs(num - nums[index +1]):num))

//option2
// const arrayMaximalAdjacentDifference=(nums)=>nums
// .map((num,index)=>Math.abs(num - nums[index +1]))
// .map(item=>item>0?item:0)
// .reduce((acc,cur)=>acc>cur?acc:cur)

//option3
// const arrayMaximalAdjacentDifference=(nums)=>Math.max(...nums
// .map((num,index)=>Math.abs(num - nums[index +1]))
// .map(item=>item>0?item:0))

/**
* 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 5: ", result);
        
        // assert
        expect(result).toBe(0);
    });
});