Is there a difference between using a pipe and a method in template interpolation in an Angular application?
For example:
{{ name.toLowerCase
Please read documentation about pipes paying attention to such called "pure" and "impure" pipes. That should address the question about the performance for pipes.
Calling a function like this
{{ name.toLowerCase() }}
depends of a function itself. In this specific case I think it is the same as pipe, but pipes where specifically created for that purpose.