Hi,
I want to know if a java array is the same underlying object with a js
native array.
@JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "Object")
> public static class MyObject {
> int x;
>
> @JsOverlay
> public static MyObject create(int x) {
> final MyObject o = new MyObject();
> o.x = x;
> return o;
> }
> }
>
>
@Override
> public void onModuleLoad() {
> // check if java arrays are implemented by the same underlying
> native array
> final MyObject[] java_array = new MyObject[] { MyObject.create(1),
> MyObject.create(4), MyObject.create(16) };
> DomGlobal.console.log((Object) java_array);
> // cast to nativeJsArray<double>
> final JsArray<MyObject> js_array = Js.uncheckedCast(java_array);
> DomGlobal.console.log(js_array);
> // delete second object
> // DomGlobal.window.alert("Check this out");
> js_array.splice(1, 1);
> DomGlobal.console.log((Object) java_array);
> DomGlobal.console.log(js_array);
>
return;
> }
>
*Results*:
Array(3) [ {…}, {…}, {…} ]
> Array(3) [ {…}, {…}, {…} ]
> Array [ {…}, {…} ]
> Array [ {…}, {…} ]
>
So the splice call succeeds and I can remove elements from the java array.
Cool. So this is evidence that java arrays are backed by js arrays,
So
- Arrays, double are mapped to native types.
- We have @JsFunction and Function
- int is mapped to js number --> double
Is it possible to also map java.lang.String to native JsString
final JsString x1 = new JsString("x1");
> DomGlobal.console.log(x1);
> final String x2 = Js.uncheckedCast(x1);
> DomGlobal.console.log((Object) new String[] {x2});
> final String x3 = x2.replaceAll("1", "3");
> DomGlobal.console.log((Object) new String[] {x3});
> return;
>
*Results*:
> String { "x1" } <- native js string
> Array [ String ] <-- java clas String with value "x1"
> Array [ "x3" ] <- native js string ???? Why?
>
> I don't really understand the results. Any comment?
--
Vassilis Virvilis
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