Hash.Extras

docs

The MooTools Hash is pretty powerful and complete and for the most part we wouldn't have much to add to it. We do however have two methods that we use occassionally.

This method returns a value from an object given a path to it (a string). Example:

$H({
    food: {
        fruits: {
            apples: "red",
            lemon: "yellow"
        }
    }
}).getFromPath("food.fruits.apples");
//returns "red"

This method just removes any keys from the hash whose values are undefined or null. You can actually define your own logic by passing in your own method. By default, it uses $defined.

var myHash = $H({
	foo: 'bar',
	something: 'else',
	missing: null
});
myHash.cleanValues();
console.log(myHash.getKeys());

Here I define what to clean as any integer value that is negative:

var myHash = $H({
	a: -1,
	b: 2,
	c: 0,
	d: -5
});
myHash.cleanValues(function(value){
	if ($type(value) != "number") return true;
	return value >= 0;
});
console.log(myHash.getKeys());

This method will execute any value in the hash that is a function. Any arguments passed to run will be passed to each method in the hash. I use this to hold all my page initialization methods. For example:

var MySite = {
	init: new Hash({
		setupSearch: function(){
			//set stuff up
		},
		setupMenu: function(){
			//set up menu stuff
		},
		pingGoogleAnalytics: function(){
			//ping google
		},
		etc...
	})
};
 
window.addEvent('domready', MySite.init.run.bind(MySite.init));
//same as
window.addEvent('domready', function(){
	MySite.init.run();
});

This way my startup code can grow without me having to go manage both a list of functions and a startup method that calls them all. I just add a new member to the hash and it automatically gets included win the whole has is run.