main.js

var submitStream = $('#search-form').asEventStream('submit');

submitStream.doAction(".preventDefault")
.flatMapLatest(function (e) {
    var searchString = $(e.target).children('#search').val()
    if (searchString !== "") {
        return Bacon.constant(searchString);
    } else {
        return Bacon.never();
    }
})
.skipDuplicates()
.onValue(function (e) {
    console.log(e);
});