How to convert a Map<String,String> into a JavaScript Object

[der Raab]

Hi everybody,

I struggle with this very basic task: I need to convert a Map<String,String> into an basic JavaScript Object but the compile doesn't allow this:

var map : Map<String,String> = propertiesParser.getMap();
var object : Dynamic = {};

for ( key in map.keys() ) {

 object[ key ] = map.get( key );
}

The compiler warns: String should be int on line object[ key ] = map.get( key );

[Ivan Tivonenko]

Just do

Reflect.setField(object, key, map.get(key));

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[der Raab]

Thank you very much! But i wonder if there is another syntax? Without the static method overhead?

[Ivan Tivonenko]

Reflect methods will be optimized for each platform as much as possible.

For javascript, as example, this will generate

object.key = ...

[der Raab]

No, in JavaScript this get's generated:

var map = propertiesParser.getMap();
var object = { };
var $it0 = map.keys();
while( $it0.hasNext() ) {
 var key = $it0.next();
 Reflect.setField(object,key,map.get(key));
}


//With this reflect method:


Reflect.setField = function(o,field,value) {
 o[field] = value;
};

So it would be better to have it inlined. Anyway - thank you! 

[Jonas Malaco Filho]

setField should generally get inlined but, probably due to some underlying 'untyped' in Map.get(), that doesn't happen due to safety reasons; you should check haxe/issues/2179.

But all is not lost. If you assign the value to some var, setField ends up inlined: try.haxe.org/#42F04.

[der Raab]

Great hint Jonas! This works:

http://try.haxe.org/#aeB0f

Thank you very much!