function adjacentElementsProduct(nums) {
    let maxProduct = 0;
    // iterate through array getting products of every pair
    for (let i=0; i<nums.length; i++) {
        // check if last element
        if (i === nums.length - 1) break;
        else {
            let nextAdjacentProduct = nums[i]*nums[i+1];
            if (nextAdjacentProduct > maxProduct) maxProduct = nextAdjacentProduct;
        }   
    }
    return maxProduct;
}



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