JS BinRepresentation of a custom String Object// source https://jsbin.com/jibuso

custom_string.js

var MyString = function(source){
  var arr = [];
  
  for(var index in source){
    arr.push(source[index]);
    //Public property
    this[index] = source[index];
  }
  
  //Public property
  this['length'] = arr.length;
  
  //Public getter
  this.getStringArray = function() {
  	return arr;
  }
};

MyString.prototype.toString = function(){
  return this.getStringArray().join('');
};


MyString.prototype.charAt = function(i){
  return this.getStringArray()[i];
};


MyString.prototype.concat = function(source2){
  return this.toString() + source2;
};

MyString.prototype.slice = function(start, end){
  var slice = '';
  var arr = this.getStringArray();
  for(var i=start; i < end; i++){
    slice += arr[i];
  }
  return slice;
};

MyString.prototype.split = function(char){
  var pre = '', post = '', split = '';
  var arr = this.getStringArray();
  var i = 0;
  
  while(arr[i] != char){
    pre += arr[i++];
  }
  
  i++;
  while(arr[i] !== undefined){
    post += arr[i++];
  }
  
  return [pre, split, post];
};

MyString.prototype.reverse = function(){
  var arr = this.getStringArray();
  var s = '';
  for(var i = arr.length - 1; i >= 0; i--){
    s += arr[i];
  }
  
  return s;
}