ExercisesChapter4.js

function MyString(text){
   this.text = text;
   
   this.length = function(){
      var len = 0;
      for (var iter in this.text){
        len = len + 1;
      }
      return len;
   };

   this.toString = function(){
     return this.text; 
   };
    
   this.valueOf = function(){
     return this.text; 
   };
   
   this.charAt = function(index){
      var idx = (Number(index))? (Number(index)): 0;
      for (var iter in this.text){
        if(idx == iter){
          char = this.text[idx];
        }
      }
      return char;
   }; 
    
     
   this.concat = function(newText){
     return this.text + newText; 
   };
    
    
   this.slice = function(start, end){
     var slicedText = "";
     end = (end <= -1) ? (text.length - 1): end;
     for (var iter in this.text){
        if(iter >= start && iter < end){
          slicedText += this.text[iter];
        } 
      }
      return slicedText;
   };
    
    
   this.split = function(separator){
     var result = [];
     var slice = "";
     for (var iter in this.text){
        if( this.text[iter] == separator){
          result.push(slice);
          slice = "";
        }else{
          slice += this.text[iter];
        }
      }
      result.push(slice);
      return result;
   };
    
       
   this.reverse = function(){  
     var stringArray = [];
     for (var iter in this.text){
       stringArray.push(this.text[iter]);
     }

     return stringArray.reverse().join("");
   };
    
    
}

var test = new MyString("hello");

console.log(test.length());
console.log(test.toString());
console.log(test.charAt(1));
console.log(test.charAt('2'));
console.log(test.charAt('e'));
console.log(test.concat(' world!'));
console.log(test.slice(1,3));
console.log(test.slice(0,-5));
console.log(test.split('e'));
console.log(test.split('l'));
console.log(test.reverse());