function avoidObstacles(nums) {
    //  write code here.
    nums.sort();
    let minLen = 1;
    while(!nums.every(num=>num %minLen!==0)){
        minLen++;
    }
    return minLen;
}



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