function Map(){    
// members    
this.keyArray = new Array(); // Keys    
this.valArray = new Array(); // Values            

//methods    
this.put = put;    
this.get = get;    
this.size = size;      
this.clear = clear;    
this.keySet = keySet;
this.valSet = valSet;    
this.showMe = showMe;   // returns a string with all keys and values in map.    
this.findIt = findIt;
this.remove = remove;
}
function put( key, val ){    
	var elementIndex = this.findIt( key );        
	if( elementIndex == (-1) )    {
		this.keyArray.push( key );        
		this.valArray.push( val );    
	}    
	else    
	{        
		this.valArray[ elementIndex ] = val;    
	}
}
function get( key )
{    
	var result = null;    
	var elementIndex = this.findIt( key );    
	if( elementIndex != (-1) )    {
		result = this.valArray[ elementIndex ];    
	}          
	return result;
}
function remove( key )
{    
	var result = null;    
	var elementIndex = this.findIt( key );    
	if( elementIndex != (-1) )    
	{        
		this.keyArray = this.keyArray.removeAt(elementIndex);
		this.valArray = this.valArray.removeAt(elementIndex);    
	}          
	return ;
}
function size()
{    
	return (this.keyArray.length);  
}
function clear()
{    
	for( var i = 0; i < this.keyArray.length; i++ )    
	{        
		this.keyArray.pop(); 
		this.valArray.pop();
	}
}
function keySet()
{    
	return (this.keyArray);
}
function valSet()
{    
	return (this.valArray);   
}
function showMe()
{    
	var result= "";        
	for( var i = 0; i < this.keyArray.length; i++ )    
	{        
		result += "Key: " + this.keyArray[ i ] + "\tValues: " +
		this.valArray[ i ] + "\n";    
	}    
	return result;
}
function findIt( key )
{    
	var result = (-1);    
	for( var i = 0; i < this.keyArray.length; i++ )    
	{        
		if( this.keyArray[ i ] == key )        
		{            
			result = i;            
			break;        
		}
	}    
	return result;
}
function removeAt( index )
{  
	var part1 = this.slice( 0, index);  
	var part2 = this.slice( index+1 );  
	return(part1.concat( part2 ) );
}
Array.prototype.removeAt = removeAt;