itinerary_wizard_component.js

cities: [{name: 'Rome'}],
    steps: (function() {

        console.log('updating steps');

        var data  = [];

        $.each(this.cities, function(index, city) {

            data.push({
                name: 'step' + ++index,
                title: 'What are you going to do in ' + city.name
            })
        });

        return data;

    }).property('cities.@each'),