Qml JS Array callBackFn

Konstantin Schraubek

Hey Guys,

as https://doc.qt.io/qt-5/qtqml-javascript-functionlist.html states, theoreticly all these functions are usable in qml.

Unfortunately there are no examples and no sample code.

Could someone please provide sample code on how to use Array.forEach(callbackfn [, thisArg]). Or callbackfn in general?
A brief look in the internet had not helped me.

My understanding would be to do some like this:

onSlot:{
    someArray.forEach(element => console.log(element));
}

This is of cause not working because the "=>" combo.

Thanks in advance.

IntruderExcluder

The => works fine for me at least with Qt 5.14. And this should be fine for some earlier versions:

    Component.onCompleted: {
        let array = [1, 2, 3, 4, 5];
        array.forEach(e => console.log("Element: " + e))
    }

Anyway you can use old style syntax:

    Component.onCompleted: {
        let array = [1, 2, 3, 4, 5];
        array.forEach(function (e) { console.log("Element: " + e); })
    }

GrecKo

Arrow function (=>) are available since Qt 5.12 : https://doc.qt.io/qt-5/whatsnew512.html#qt-qml-module

For documentation about general JS types, MDN is a good resource : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

Konstantin Schraubek

Thanks guys!
Im on Qt 5.10, that explains why the "=>" is not working. Had not known about the old style syntax.

Settings this to closed.