len shorthand

[giraffekey]

Should be able to exclude len() for example:

string.substring_len(3)

Could be a shorthand for string.substring(3, string.len())

[Anders429]

As I mentioned in #6, I hesitate to extend the API for methods that are merely shorthand. However, in this case I am definitely open to the possibility of adding a fn substring_from_start(index: usize) -> &str and fn substring_to_end(index: usize) -> &str to perform s.substring(0, index) and s.substring(index, s.len()) respectively. My main interest is whether these might be more optimal in certain cases. Specifically, I suspect that something like s.substring(1, s.len()) might be slightly slower than s.substring_to_end(1), do to avoiding iterating through the char_indices all the way to the end. For sufficiently large s, that may have a significant speed increase.

I'm not sure exactly what the magnitude of such an increase would be, though. I intend to set up some benchmarks to experiment. Whenever I get around to that, I can evaluate whether such an extension to the API is worth it.

[Anders429]

Quick update on this: support for this feature is on its way through the pipeline, and will be live in version 2.0.0. It isn't implemented exactly as discussed here, but I think the way it is implemented is actually far easier to use, since it just relies on an index value implementing RangeBounds<usize>, which gives all kinds of freedom that wouldn't be available otherwise.

See #9 for more details on the change, and #11 for the actual PR containing the change.

I'll close this issue when it is merged into master.