Uno JS TreeArray iterate

How-to Discussions
1

Hi fuse,

I’m writing custom expression class and now i need to iterate javascript array in uno code. How to iterate javascript array in uno ?

[UXFunction("sum")]
public sealed class Sum: BinaryOperator
{
	[UXConstructor]
	public Sum([UXParameter("Left")] Fuse.Reactive.Expression left, [UXParameter("Right")] Fuse.Reactive.Expression right): 
		base(left, right, "sum") {}
		
	protected override bool TryCompute(object left, object right, out object result)
	{
		  

		 debug_log  left;  /* this is give me class name Fuse.Scripting.JavaScript.TreeArray;  

tried  this => Fuse.Scripting.JavaScript.TreeArray ar=left as Fuse.Scripting.JavaScript.TreeArray;  and throw an error

Fuse.Scripting.JavaScript does not contain type or namespace 'TreeArray'. Could you be missing a package reference?

*/
		result="00";
		return true;
	}
}
2

Hi Hilmi,

before we suggest anything particular, could you please show us some context? i.e., how are you going to use this in UX, and why?

3

Thanks UIdis,

I liked expression thing, and start playing with this :slight_smile:

Particularly i’m use vue.js to web side and vue have ‘mixins’. Some of my components have dynamic behaviour. i.e. pivot tables column aggregation like this;

RN, CT_1, CT_2, CT_3, … CT_N -> CT_{?} is dynamic columns and i need only aggregate this columns per row, i solve this with mixin in vue. Or create function ‘sum’ named and it aggregate object array -> sum(objArray,‘columnName’)

I’m trying to do something like this;

var objArray=[{name:'H1',total:500},{name:'H2',total:400},{name:'H3',total:750}];

<Text Value="{=sum({objArray},'total')}" /> // 1650

always boring to write the same thing on several pages

4

Understood. In Fuse, you’ll be better off doing these types of calculations in JavaScript, using .map on your Observables, flattening them or if you’re using the new FuseJS/Models approach, you could just have a getter on a class.