text: class Stringer{
      constructor(innerString , innerLength){
          this.innerString  = innerString ;
          this.innerLength = Number(innerLength);
      }
      get innerLength() {
          return this._innerLength;
      }
      set innerLength(value) {
          if (value < 0) {
              this._innerLength = 0;
          }else {
              this._innerLength = value;
          }
      }
      increase(num){
          this.innerLength += num;
      }
      decrease(num){
          this.innerLength -= num;
      }
      toString(){
          if(this.innerString.length > this.innerLength){
              return this.innerString.substring(0, this.innerLength) + '...';
          }
  
          return this.innerString;
      }
  }
  
  let test = new Stringer('Test', 5);
  console.log(test.toString()); //Test
  
  test.decrease(3);
  console.log(test.toString()); //Te...
  
  test.decrease(5);
  console.log(test.toString()); //...
  
  test.increase(4);
  console.log(test.toString()); //Test
  