QML - Javascript: Does Javascript support EcmaScript 6?

[Ibrahim]

Hi; I think Javascript for QML doesn't support ES6 (EcmaScript 6). Well, Is there any way for EcmaScript6 features? Thanks.

[6thC]

http://doc.qt.io/qt-5/qtqml-javascript-functionlist.html has some functions commented with

// ECMAScript 6:

Was there something specific?

[Ibrahim]

@6thC thanks. I want to use arrow functions, default parameter values, rest parameters and spread operator. Are they possible?

[Eeli K]

@Ibrahim Is it too difficult to test it yourself? Add for example to any item in qml (example taken from your link):

Component.onCompleted: {
                var params = [ "hello", true, 7 ];
                var other = [ 1, 2, ...params ]; // [ 1, 2, "hello", true, 7 ]

                var str = "foo";
                var chars = [ ...str ]; // [ "f", "o", "o" ]
            }

and you will see if it works.

[Stephen Quan]

Arrow functions - not working:

// SyntaxError: Unexpected token `>'
var sq = (x => x * x);
sq(2);

Spread operator - not working.

// SyntaxError: Unexpected token `;'
var str = "foo";
var chars = [ ...str ];

Ongoing unresolved bug:

https://bugreports.qt.io/browse/QTBUG-47735

[iangregor]

Check this one... [EDIT: Non-Qt link removed --JKSH]

[GrecKo]

And for a noteworthy update: Qt 5.12 now supports ES6.

[sirhcybe]

@GrecKo Support seems limited. I can't get arrow functions to work: https://forum.qt.io/topic/100526/what-parts-of-ecmascript-7-are-supported-in-qt-5-12

[sirhcybe]

@GrecKo Never mind, I found your SO post explaining that I need to download the Qt Creator 4.9.0-beta2. That supports the new syntax.