codewars8kyu6.js

/*Write me a function stringy that takes a size and returns a string of alternating '1s' and '0s'. The string should start with a 1.
A string with size 6 should return :'101010'. With size 4 should return : '1010'.With size 12 should return : '101010101010'.
The size will always be positive and will only use whole numbers.  */
function stringy(size) {
  let arr = [];
  arr.length = size;
  
  if(size % 2 == 0){
    for(let i = 0; i < arr.length; i += 2){
      arr[i] = 1;
      arr[i+1] = 0;
    } 
  }
  else {
    for(let i = 0; i < arr.length -2; i += 2){
      arr[i] = 1;
      arr[i+1] = 0;
      arr[i+2] = 1;
    }  
  }

  result = arr.join('');
  return result;
}

/*Create a class Ball. Ball objects should accept one argument for "ball type" when instantiated.
If no arguments are given, ball objects should instantiate with a "ball type" of "regular." */
var Ball = function(ballType) {
  
  if (!ballType){
    this.ballType = "regular";
  } else {
    this.ballType = ballType;
  } return this.ballType;
};

/*Your function takes two arguments: current father's age (years),current age of his son (years)
Сalculate how many years ago the father was twice as old as his son (or in how many years he will be twice as old).*/
function twiceAsOld(dadYearsOld, sonYearsOld) {
   if(dadYearsOld > sonYearsOld * 2) {
     result = dadYearsOld - sonYearsOld * 2;
   }
   else if(dadYearsOld < sonYearsOld * 2) {
     result = sonYearsOld * 2 - dadYearsOld;
   } 
  else {
    result = 0;
  }
  return result;
}


//Write a function called repeat_string which repeats the given string str exactly count times.
function repeatStr (n, s) {
  return s.repeat(n);
}