function avoidObstacles(nums) {
    nums.sort();
    let jump = nums.slice(-1)[0];
    
    let min = jump;
    while (jump > 1) {
        jump--;
        
        if (nums.every(item => item % jump !== 0)) min = jump;
    }
    
    return min;
}

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