function adjacentElementsProduct(nums) {
    //  write code here.
    let len = nums.length,val = 0
    for(let i=0; i<len; i++){
        if (nums[i] * nums[i+1] > val) {
            val = nums[i] * nums[i+1]
        }
    }
    
    return val
    
}



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