[Interest] Qml Object prototype generate errors

[Jérôme Godbout]

Hi,
We are on Qt 5.5.1 and we try to add javascript Object prototype like this

.pragma library
Object.prototype.values = function(o)
{
   return Object.keys(o || {}).map(function(i){ return o[i]; });
}

We want to add the ECMA-2017 features, remove it when available into the JS
engine:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values

This give us some problem with javascript map for( in ) loop, but that's
okay we can fix them with Object.keys.forEach(). But I also get an error
with the Table View

Qt55/msvc2015_64_opengl/qml/QtQuick/Controls/Private/BasicTableView.qml:695:
ReferenceError: modelData is not defined

This line reference the modelData, for an empty table view this seem to
failed and have an entry for values property of object for some reason.

I would like to know if this is prohibited to add prototype to Object or we
are conflicting with something else here? Or is it just a bug into the
table view binding code.

Why adding a prototype to Object break the for in loop with empty map?

var objects = {};
for(var key in objects)
{
   console.log('my key is ' + key); //--> my key is values
}


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Jerome Godbout
Software Developer
2035 rue du Haut-Bord, Québec, QC, Canada. G1N 4R7
T:  +1 418 527-1388
E: jerome at bodycad.com
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