d3 sortKeys in nest function

<html>
    <head>
        <title>D3 Simple Nest Example</title>
        <script src="https://d3js.org/d3.v2.js"></script>
    </head>
    
    <body>
    
    <script>
 
         // expected date format in csv file
         var in_format = d3.time.format("%Y-%m-%d");

d3.csv("./nest1.csv", function(csv_data){
                    
            // coerce csv data into correct formats
            csv_data.forEach(function(line) {
                line.time = parseInt(line.time);
                line.date = in_format.parse(line.date);
            })
            
            // now create one array for each unique group
            var nested_data = d3.nest()
                .key(function(d) { return d.group; })
                .entries(csv_data);
                
            
            console.debug(nested_data);
            alert('Key: group, Sort:None\n'+dump(nested_data));
            
            
            /*
            OR nest by date 
            */
            
            var nested_data = d3.nest()
                .key(function(d) { return d.date; })
                .entries(csv_data);
                
            
            console.debug(nested_data);
            alert('Key: date, Sort:None\n'+dump(nested_data));

// ADD sortKeys
            
            var nested_data = d3.nest()
                .key(function(d) { return d.date; })
                .sortKeys(d3.ascending)
                .entries(csv_data);
                
            
            console.debug(nested_data);
            alert('Key: date, Sort:ascending\nEXPECTING TO BE SORTED BY DATE'+dump(nested_data));
            
            
            /*
            OR nest by time 
            */
            
            var nested_data = d3.nest()
                .key(function(d) { return d.time; })
                .entries(csv_data);
                
            
            console.debug(nested_data);
            alert('Key: time, Sort:None\n'+dump(nested_data));

// ADD sortKeys
            
            var nested_data = d3.nest()
                .key(function(d) { return d.time; })
                .sortKeys(d3.ascending)
                .entries(csv_data);
                
            
            console.debug(nested_data);
            alert('Key: time, Sort:ascending\n'+dump(nested_data));
            
                        
        });
        
        
function dump(arr,level) {
    // from this page: https://www.openjs.com/scripts/others/dump_function_php_print_r.php
	var dumped_text = "";
	if(!level) level = 0;
	
	//The padding given at the beginning of the line.
	var level_padding = "";
	for(var j=0;j<level+1;j++) level_padding += "    ";
	
	if(typeof(arr) == 'object') { //Array/Hashes/Objects 
		for(var item in arr) {
			var value = arr[item];
			
			if(typeof(value) == 'object') { //If it is an array,
				dumped_text += level_padding + "'" + item + "':\n";
				dumped_text += dump(value,level+1);
			} else {
				dumped_text += level_padding + "'" + item + "' => \"" + value + "\"\n";
			}
		}
	} else { //Stings/Chars/Numbers etc.
		dumped_text = "===>"+arr+"<===("+typeof(arr)+")";
	}
	return dumped_text;
}

</script>
    
    </body>
</html>

Modified http://d3js.org/d3.v2.js to a secure url

https://d3js.org/d3.v2.js