Find by ID in KnockOutJS

Question

Given the following, how do I get id 10 back out?

function ChildListViewModel()
{
    var self = this;
    self.children = ko.observableArray([]);   

    self.children.push({id:20,name:"Jake"});
    self.children.push({id:10,name:"Jake"});

    self.find = function(id)
    {   
        console.log(self.children().length);
        setTimeout(function(){console.log(self.children().length);}, 500);
        found = ko.utils.arrayFirst(self.children(), function(child) {
            return child.id() === id;
        });

        console.log(found);

        return found;
    }

}

I want to do something like

ChildVM.find(10);

All attempts using ko.utils.arrayFirst and ko.utils.arrayForEach have failed me.

EDIT

This now works, see selected answers.

Issues around loading order and AJAX meant this was not working as it should do.

Answer 1

return ko.utils.arrayFirst(self.children(), function(child) {
    return child.id === id;
});

Just remember to use self.children() to get to the underlying array.