Is there Lambda Support in Qml files?












0















i have some thing like this :



var arr = 

arr.indexOf(element => element.includes(''))


QtCreator gives error for this my Qt version is 5.12 and i am using QtCreator 4.8
can i use this kind of lambda expressions in qml ?






qml qtquick2







share|improve this question


















  • 2





    First of all, the method called findIndex, not indexOf if we talk about lambdas. But anyway, findIndex doesn't supported in ECMAScript subset of QML. See here for full list of supported functions.

    – folibis
    Jan 1 at 12:08


















0















i have some thing like this :



var arr = 

arr.indexOf(element => element.includes(''))


QtCreator gives error for this my Qt version is 5.12 and i am using QtCreator 4.8
can i use this kind of lambda expressions in qml ?






qml qtquick2







share|improve this question


















  • 2





    First of all, the method called findIndex, not indexOf if we talk about lambdas. But anyway, findIndex doesn't supported in ECMAScript subset of QML. See here for full list of supported functions.

    – folibis
    Jan 1 at 12:08
















0












0








0








i have some thing like this :



var arr = 

arr.indexOf(element => element.includes(''))


QtCreator gives error for this my Qt version is 5.12 and i am using QtCreator 4.8
can i use this kind of lambda expressions in qml ?






qml qtquick2







share|improve this question














i have some thing like this :



var arr = 

arr.indexOf(element => element.includes(''))


QtCreator gives error for this my Qt version is 5.12 and i am using QtCreator 4.8
can i use this kind of lambda expressions in qml ?






qml qtquick2




qml qtquick2






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Jan 1 at 6:36









MoreMagMoreMag

123




123








  • 2





    First of all, the method called findIndex, not indexOf if we talk about lambdas. But anyway, findIndex doesn't supported in ECMAScript subset of QML. See here for full list of supported functions.

    – folibis
    Jan 1 at 12:08
















  • 2





    First of all, the method called findIndex, not indexOf if we talk about lambdas. But anyway, findIndex doesn't supported in ECMAScript subset of QML. See here for full list of supported functions.

    – folibis
    Jan 1 at 12:08










2




2





First of all, the method called findIndex, not indexOf if we talk about lambdas. But anyway, findIndex doesn't supported in ECMAScript subset of QML. See here for full list of supported functions.

– folibis
Jan 1 at 12:08







First of all, the method called findIndex, not indexOf if we talk about lambdas. But anyway, findIndex doesn't supported in ECMAScript subset of QML. See here for full list of supported functions.

– folibis
Jan 1 at 12:08














1 Answer
1






active

oldest

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3














That is just a Qt Creator bug, arrow functions are supported in Qt 5.12 and later.
QtCreator will properly support them in the upcoming 4.9 version and stop displaying warnings for it (QTCREATORBUG-21301 & QTCREATORBUG-20341).



In your case however, as folibis said, you need findIndex if you want to provide a predicate. It does work in 5.12, the page of the supported functions is not very reliable.



Qt 5.12 should support most of the standard ECMAScript functions, look at MDN for reference and try it your Qt code.



{

    let arr = ['a', 'ab', 'abc', 'abcd'];

    let index = arr.findIndex(element => element.includes('c'));

    let abcIsPresent = arr.includes('abc');

    print(index, abcIsPresent);

}


This codes runs in Qt 5.12 and outputs 2 true.






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    3














    That is just a Qt Creator bug, arrow functions are supported in Qt 5.12 and later.
    QtCreator will properly support them in the upcoming 4.9 version and stop displaying warnings for it (QTCREATORBUG-21301 & QTCREATORBUG-20341).



    In your case however, as folibis said, you need findIndex if you want to provide a predicate. It does work in 5.12, the page of the supported functions is not very reliable.



    Qt 5.12 should support most of the standard ECMAScript functions, look at MDN for reference and try it your Qt code.



    {
    
    let arr = ['a', 'ab', 'abc', 'abcd'];
    
    let index = arr.findIndex(element => element.includes('c'));
    
    let abcIsPresent = arr.includes('abc');
    
    print(index, abcIsPresent);
    
}


    This codes runs in Qt 5.12 and outputs 2 true.






    share|improve this answer




























      3














      That is just a Qt Creator bug, arrow functions are supported in Qt 5.12 and later.
      QtCreator will properly support them in the upcoming 4.9 version and stop displaying warnings for it (QTCREATORBUG-21301 & QTCREATORBUG-20341).



      In your case however, as folibis said, you need findIndex if you want to provide a predicate. It does work in 5.12, the page of the supported functions is not very reliable.



      Qt 5.12 should support most of the standard ECMAScript functions, look at MDN for reference and try it your Qt code.



      {
      
    let arr = ['a', 'ab', 'abc', 'abcd'];
      
    let index = arr.findIndex(element => element.includes('c'));
      
    let abcIsPresent = arr.includes('abc');
      
    print(index, abcIsPresent);
      
}


      This codes runs in Qt 5.12 and outputs 2 true.






      share|improve this answer


























        3












        3








        3







        That is just a Qt Creator bug, arrow functions are supported in Qt 5.12 and later.
        QtCreator will properly support them in the upcoming 4.9 version and stop displaying warnings for it (QTCREATORBUG-21301 & QTCREATORBUG-20341).



        In your case however, as folibis said, you need findIndex if you want to provide a predicate. It does work in 5.12, the page of the supported functions is not very reliable.



        Qt 5.12 should support most of the standard ECMAScript functions, look at MDN for reference and try it your Qt code.



        {
        
    let arr = ['a', 'ab', 'abc', 'abcd'];
        
    let index = arr.findIndex(element => element.includes('c'));
        
    let abcIsPresent = arr.includes('abc');
        
    print(index, abcIsPresent);
        
}


        This codes runs in Qt 5.12 and outputs 2 true.






        share|improve this answer













        That is just a Qt Creator bug, arrow functions are supported in Qt 5.12 and later.
        QtCreator will properly support them in the upcoming 4.9 version and stop displaying warnings for it (QTCREATORBUG-21301 & QTCREATORBUG-20341).



        In your case however, as folibis said, you need findIndex if you want to provide a predicate. It does work in 5.12, the page of the supported functions is not very reliable.



        Qt 5.12 should support most of the standard ECMAScript functions, look at MDN for reference and try it your Qt code.



        {
        
    let arr = ['a', 'ab', 'abc', 'abcd'];
        
    let index = arr.findIndex(element => element.includes('c'));
        
    let abcIsPresent = arr.includes('abc');
        
    print(index, abcIsPresent);
        
}


        This codes runs in Qt 5.12 and outputs 2 true.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 2 at 9:23









        GrecKoGrecKo

        4,0341019




        4,0341019
































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