How to know what is the last line or the index of the iteration?

[jamg44]

Is there any way to know what is the last line, or the index of the iteration?

for await (const line of chunksToLinesAsync(stream)) {
    console.log(chomp(line));
}

Thanks for your work!

[rauschma]

@jamg44 You’d have to write your own utilities (e.g. via generators):

• A function that returns an iterable over [currentValue, nextValue] (the latter being undefined for the last currentValue.
• A function that returns an iterable over [currentValue, index].

[milahu]

this sounds similar to my problem:
expose an interactive process (repl) with a json restful apiserver
= connect stdin/stdout streams to request/response buffers

i needed something more "high level" than stringio
and by searching for "capture stdout of interactive child process in nodejs"
i found a stackoverflow question on interactive terminal emulation
aka implementing the TTY protocol in nodejs

@rauschma maybe link to pty and tty as "related projects"?
edit: pty is abandoned since node 8, active fork in node-pty