function adjacentElementsProduct(nums) {
    var product = nums[0]*nums[1]
    for(var i = 0; i<= nums.length-1; i++) {
        if( nums[i]*nums[i+1] > product) {
            product = nums[i]*nums[i+1]
        }
    }
    return product
}



/**
* 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);
    });
    
     it('returns largest product of adjacent values 2', () => {
        // arrange
        const nums2 = [3, 6, -2, 4, 7, 3, 9, 4];
        
        // act
        const result2 = adjacentElementsProduct(nums2);

        // log
        console.log("result2: ", result2);
        
        // assert
        expect(result2).toBe(36);
    });
    
    it('returns largest product of adjacent values 3', () => {
        // arrange
        const nums3 = [-1, 1, -2, 3, -1, 3, -4, 0];
        
        // act
        const result3 = adjacentElementsProduct(nums3);

        // log
        console.log("result3: ", result3);
        
        // assert
        expect(result3).toBe(0);
    });
    
    it('returns largest product of adjacent values 4', () => {
        // arrange
        const nums4 = [-1, 1, -2, 3, -1, 3, -4];
        
        // act
        const result4 = adjacentElementsProduct(nums4);

        // log
        console.log("result4: ", result4);
        
        // assert
        expect(result4).toBe(-1);
    });
});