jquery-mobile/experiments/converter/storage.js

(function() {

var defaults = [
	{
		type: "currency",
		from: "USD",
		to: "EUR"
	},
	{
		type: "currency",
		from: "GBP",
		to: "EUR"
	}
	// TODO add back in as defaults once its possible to add other conversions, not just currencies
	/*,
	{
		type: "distance",
		from: "Miles",
		to: "Kilometer",
		rate: 1.609344
	},
	{
		type: "distance",
		from: "inch",
		to: "centimeter",
		rate: 2.54
	}*/
];

// TODO fallback to whatever else when localStorage isn't available
function get() {
	return JSON.parse( localStorage.getItem( "conversions" ) );
}
function set( value ) {
	localStorage.setItem( "conversions", JSON.stringify( value ) );
}

var conversions = get( "conversions" );
if ( !conversions ) {
	conversions = defaults.slice();
	set( conversions );
}
window.conversions = {
	store: function() {
		set( conversions );
	},
	all: function() {
		return conversions;
	},
	clear: function() {
		conversions.length = 0;
		this.store();
	},
	restore: function() {
		conversions.length = 0;
		$.extend( conversions, defaults );
		this.store();
	},
	remove: function( tofrom ) {
		$.each( conversions, function( index, conversion ) {
			if ( ( conversion.from + conversion.to ) === tofrom ) {
				conversions.splice( index, 1 );
				return false;
			}
		});
		this.store();
	}
};

})();