Filtering through a multidimensional array using underscore.js

Question

I have an array of event objects called events. Each event has markets, an array containing market objects.

Answer 1

No need for Underscore, you could do this with native JS.

var events = [{markets:[{outcomes:[{test:x},...]},...]},...];
return events.filter(function(event) {
    return event.markets.some(function(market) {
        return market.outcomes.some(function(outcome) {
            return "test" in outcome;
        });
    });
});

Yet of course you could also use the corresponding underscore methods (filter/select and any/some).