function extractEachKth(nums, index) {
    
    return nums.filter(function (num, arrayIndex){
        //check if it's the first index, return it..
        if(arrayIndex !== 0){
            //Check the next index is divisible by the index number provided, and return true if not to return it. If it is divisble return false.
           if (((arrayIndex+1)/index)%1 === 0){
               return false;
           }else{
               return true;
           }
        }else{
            return true;
        }
    });
}



/**
* Test Suite 
*/
describe('extractEachKth()', () => {
    it('returns largest positive integer possible for digit count', () => {
        // arrange
        const nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
        const index = 3;
        
        // act
        const result = extractEachKth(nums, index);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toEqual([1, 2, 4, 5, 7, 8, 10]);
    });
});