function avoidObstacles(nums) {
    // find the smallest number that is not a common denominator of the other numbers
    let avoids = false;
    let jumperNum = 0;
    while (!avoids) {
        jumperNum++;
        avoids = nums.every(num => num % jumperNum !== 0);        
    }
    return jumperNum;
}

/**
* Test Suite 
*/
describe('avoidObstacles()', () => {
    it('returns minimal number of jumps in between numbers', () => {
        // arrange
        const nums = [5, 3, 6, 7, 9];
        
        // act
        const result = avoidObstacles(nums);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(4);
    });
});