Question

I have an array of event objects called events. Each event has markets, an array containing market objects. Inside here there is another array called outcomes, containing outcome objects.

I want to use Underscore.js or some other method to find all of the events which have markets which have outcomes which have a property named test.

I imagine this would be achieved using a series of filters but I didn’t have much luck!

Answer 1

I think you can do this using the Underscore.js filter and some (aka “any”) methods:

// filter where condition is true
_.filter(events, function(evt) {

    // return true where condition is true for any market
    return _.any(evt.markets, function(mkt) {

        // return true where any outcome has a "test" property defined
        return _.any(mkt.outcomes, function(outc) {
            return outc.test !== undefined ;
        });
    });
});