code: function(n){
  
      	if(!_.isNumber(n)){
              return;
  	    }
  
          // Avoid stepping over
          if(this._data[this._itr + n] === undefined){
              return;
          }
  
          // Advance num steps
          this._itr += n;
      }
docs: Once a phone number is found, advance the array iterator by the length of the previous examined blocks so these are excluded from the next iteration (chunk-wise stepping)
  @param {number} n - number of steps to advance
  @return {void}