Knockout Utilities

gistfile1.js

/**
 * A recursive deep-cloning utility, specifically for KO ViewModels.
 * @author  Nir Azuelos
 * @param   {object} input
 * @returns {object} output
 */
ko.utils.clone = function(input) {
    var mapped = ko.mapping.fromJS(input, {
        create: function (options) {
            return ko.mapping.visitModel(options.data, function (value, parent) {
                var mapped = value;

                if(parent && value && typeof value === "object")
                    mapped = ko.utils.clone(value);

                if (ko.isObservable(mapped)) return ko.observable(mapped.peek());
                return mapped;
            });
        }
    });
    delete mapped["__ko_mapping__"];
    return mapped;
}
    
/**
 * A small handy observable / computed function to toggle it's boolean value.
 * @author Nir Azuelos
 * @returns {Function}
 */
ko.observable.fn.toggle = ko.computed.fn.toggle = function(state) {
    this(typeof state === "boolean" ? state : !this());
};

/**
 * A small handy observable / computed function that wraps around the inverse of it's boolean value.
 * @author Nir Azuelos
 * @returns {Function}
 */
ko.observable.fn.inverse = ko.computed.fn.inverse = function() {
    return ko.pureComputed(function() { return !this(); }, this);
};