And if you're happy with this approach, I'd like to implement more LINQ-ish array functions. array.sum, array.average, array.all, array.any, array.min, array.max and maybe array.groupby.

Oh definitely, you can add them as part of this PR

Hi,

I really appreciate these additions; great work!

I reviewed the array.aggregate implementation and believe it could be improved by making the seed value optional. Making the seed value optional can enhance flexibility and usability for cases where the initial value isn't necessary or when the user prefers the aggregation to start directly with the elements of the array. Specifically, if no seed value is provided, it would be beneficial to automatically use the first item of the list as the current value and the second item as the next value. This approach simplifies the function's usage for common aggregation tasks, such as summing values or concatenating strings, where the natural starting point is the first element of the array. It also aligns with the behavior of similar functions in other programming languages, making it more intuitive for users transitioning from different backgrounds.

What do you think?

@r-Larch I played around with that idea. The order if the 2 parameters would need to swap from seed & function to function and optional seed. Right? But when I tried that with the seed provided, the function consumes the seed instead of it being passed into array.aggregate. Not sure if it's a bug or by design.

Maybe just easier to implement array.reduce, which wouldn't have the seed parameter.

@r-Larch I played around with that idea. The order if the 2 parameters would need to swap from seed & function to function and optional seed. Right? But when I tried that with the seed provided, the function consumes the seed instead of it being passed into array.aggregate. Not sure if it's a bug or by design.

Hmm.. for me it looks like a bug but I don't know.

Does it work with parameters like this: (seed optional before func)

In C#

public static object Aggregate(TemplateContext context, SourceSpan span, IEnumerable list, object? arg1, object? arg2);
if (arg1 is IScriptCustomFunction) ...
if (arg2 is IScriptCustomFunction) ...