A look inside "filter" function defintion

[Kyle Ingraham]

On Tuesday, 2 August 2022 at 12:39:41 UTC, pascal111 wrote:
> but I'm still stuck. Do you have a down-to-earth example for 
> beginners to understand this concept?

I often go back to this post when writing templates:

https://dlang.org/blog/2020/07/31/the-abcs-of-templates-in-d/

It helped me when I was first trying to understand them.