function avoidObstacles(nums) {
    let sorted = nums.sort(function(a, b){
        return a - b;
    });
    let skip = 2;
    avoid();
    function avoid(){
        sorted.forEach(item => {
            if(item % skip === 0){
                skip++;
                avoid();
            }
        });
    }
    return skip;
}



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