Using a single object called dependency tracker i.e. ko.dependencyDetection you can determine when the value get updated. When you declare a computed observable, KO immediately gets its initial value and updated computed observable.
Lets see an example for Dependency Tracking:
<!DOCTYPE html> <html> <head> <title>Dependency Tracking - KnockoutJS</title> <script src="http://ajax.aspnetcdn.com/ajax/knockout/knockout-3.1.0.js" type="text/javascript"></script> </head> <body> <div> <form data-bind="submit: addCountry"> <b>Add Country:</b> <input data-bind='value: newCountry, valueUpdate: "afterkeydown"'/> <button type="submit" data-bind="enable: newCountry().length > 0">Add Country</button> <p><b>Your Country List:</b></p> <select multiple="multiple" width="50" height="auto" data-bind="options: countries"> </select> </form> </div> <script> var AddCountry = function(countries) { this.countries = ko.observableArray(countries); this.newCountry = ko.observable(""); this.addCountry = function() { if (this.newCountry() != "") { this.countries.push(this.newCountry()); this.newCountry(""); } }.bind(this); }; ko.applyBindings(new AddCountry(["India", "Australia", "South Africa", "Zimbabwe"])); </script> </body> </html>

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