无法嵌套forEach可以在Javascript中使用

Question

So I guess the title is selfexplanatory. I have some code with nested forEach loops inside it. The loops are iterating over an array of chapter objects. Each object can have multiple child nodes and they again can have multiple child nodes, and so on.

I want to end up with one array which contains nested arrays with the child nodes.

So far my code looks like this:

exports.chapter = function(req, res) {
    var chapters = [],
        result = [];

    chapters = exports.index(req, res);

    chapters.forEach(function(chapter) {
        if(chapter.orphan){
            result.add({
                'chapter': chapter,
                'children': getChildren(chapter.children)
            });
        }
    });

    function getChildren(siblings) {
        var children = [];

        chapters.forEach(function(chapter) {
            if($.inArray(chapter, siblings)){
                children.add({
                    'chapter': chapter,
                    'children': getChildren(chapter.children)
                });
            }
        });

        return children;
    };
};

I don't get any errors except for my page not loading. It doesn't write anything in my console. I think it's a problem in the setup but I'm unable to find out where at the moment. Really hope you guys can help.

Answer 1

Most likely problem is here:

if($.inArray(chapter, siblings)){

$.inArray is a horribly misnamed method: It returns an index , or -1 if not found, not a flag as the name implies. -1 is, of course, truthy; and 0 (a valid index), is falsey, so your if probably wants to be

if($.inArray(chapter, siblings) != -1){
    // We found it...
}

or possibly

if($.inArray(chapter, siblings) == -1){
    // We didn't find it
}

Answer 2

It's a bit strange.. I don't understand why you're using 'add' instead of 'push' method. If I try to "add" an object to an array I get an usual error. Don't you?