IO API - Nevalang vs Go (descriptions and explicit opening/closing)

[emil14]

Example: our def ReadAll(filename string) (res string, err error) works only with fs files while Go's accepts abstract File interface that you can/need to get from os.Open. Go's API is about passing file descriptors around and explicitly closing them after. This is more verbose but also more flexible. Go's io.Reader might work with any streams of bytes, not just fs files.

At this point we must figure out how to implement streaming IO properly and these kinds of things are foundation for that.