Titanium WTF: Window children property

app.js

var win = Ti.UI.createWindow({ backgroundColor: "#fff", navBarHidden: true, layout: 'horizontal' });
    
    var view = Ti.UI.createView({
    	layout: 'horizontal'
    });
    
    var label1 = Ti.UI.createLabel({
    	top: 150,
    	left: 50,
    	text: 'Testing 1 ...',
    	height: '75dp',
    	width: '50%',
    	backgroundColor: "#000"
    });
    
    var textField = Ti.UI.createTextField({
    	top: 150,
    	left: 50,
    	width: '150dp',
    	height: '75dp',
    });
    
    var label2 = Ti.UI.createLabel({
    	top: 150,
    	left: 50,
    	text: 'Testing 2 ...',
    	height: '75dp',
    	width: '50%',
    	backgroundColor: "#000"
    });
    
    var picker = Ti.UI.createPicker({
    	top: 150,
    	left: 50,
    	height: '75dp',
    	backgroundColor: "#999",
        selectionIndicator : true
    });
    
    var data = [];
    
    data[0] = Ti.UI.createPickerRow({ title:'Bananas' });
    data[1] = Ti.UI.createPickerRow({ title:'Strawberries' });
    data[2] = Ti.UI.createPickerRow({ title:'Mangos' });
    data[3] = Ti.UI.createPickerRow({ title:'Grapes' });
    
    picker.add(data);
    
    view.add(label1);
    view.add(textField);
    view.add(label2);
    view.add(picker);
    
    win.add(view);
    
    win.addEventListener('open', function() {
    	Ti.API.info('View');
    	Ti.API.info(typeof view.children); // "object" - should be "[object Array]"
    	Ti.API.info(typeof view._children); // "undefined" - OK
    	Ti.API.info(view.children.length); // "4"  - OK
    	Ti.API.info('Window');
    	Ti.API.info(typeof win.children); // "object" - should be "[object Array]"
    	Ti.API.info(typeof win._children); // "object" - should be "undefined"
    	Ti.API.info(win.children.length); // "0"  - should be "1"
    	Ti.API.info(win._children.length); // "1" - should throw an exception since "_children" should be undefined
    });
    
    win.open();

Everything in JS are objects.

Open the web browser inspector and try this:

var foo = ['one', 'two', 'three'];
console.log(typeof foo);

The typeof return an "object"

:)

So I tested this code, and win._children.length throws an error:

[INFO] Window
[INFO] object
[INFO] undefined
[INFO] 1
[WARN] Exception in event callback. {
    line = 65;
    message = "'undefined' is not an object (evaluating 'win._children.length')";
    name = TypeError;
    sourceId = 166779072;
    sourceURL = " ...../app.js";
}

Yeah, you're right, mea culpa. I used "typeof" and thinking about "Object.prototype.toString.call(foo)". :)

I should have specified, this was an Android test. :D
On iOS, there is no "_children" property, that property exists on Android only and it seems it does what "children" should (and "children" does nothing).

Ah, no worries, I was going through your public gists and came across this one. :) Thats all.

The _children you are talking about, could be some private Titanium API, I mean, internal that somehow found its way to the JS.