justforfunc #26: why are there nil channels in Go?

I received a question on twitter asking if there was a good reason for nil channels other than completeness.

This is my short but intense answer to that question. I hope you enjoy it!

[ethangarnier]

I love this format, short but teaches a valuable lesson.

[zhengchaodeng]

The background music at 11:24, and all the facial and body gesture from Francesc is so cute.

[aareooon]

That is incredibly informative. Thank you!

[kesuskim]

channel concept is quite hard to get used to, but once get used to it, it is really awesome!

and now I learn more about channel, it feels always learning new thing ;( I doubt I can say I know channel at all... maybe this time...!

[MrGreen-kqds]

this is just perfect, thank you!
I demand more tutorials like this!

[brianscott]

Great episode, really enjoyed the tips I learned from this short but very useful lesson

[rajendragosavi]

Thanks for sharing this. It is very helpful.

[ThisGuyRocksLikeCrazy]

Loved this episode. Please share more neat tricks with us.

[milossimicsimo]

this is actually really great video! Good job man :D!

[paulyeoh]

Awesome, very valuable as always, thank you for the excellent episode.

[edwardrf]

Greate video! Love the short format. More code reviews please!

[tunedmystic]

Learned something new today. Thanks Francesc! 👍

[musale]

I enjoyed this episode. It was short and well explained.

[djthorpe]

I was interested in how you merge a variable number of channels in the "merge" function. It turns out you could solve this by using "reflect.SelectCase" and then replace the "select" statement with "reflect.Select" - maybe less efficient than when you know the number of channels beforehand, but useful where you want to add/remove channels whilst your program is running.

[mrvil]

Thanks for explaining nil channel use case 😀

[HerbertFischer]

@Fransesc Could you please link to the episode about the Runtime Tracer that you mentioned at #8:32 in the video description?

[mhausenblas]

Awesome as usual! What's that epic audio towards the end, around 11:23? :)

[AlbertoRestifo]

Owww yeah, a new just for func video!

[Goodvvine]

Hey, I've always wondered how is dependency injection handled in Go. Can you talk about that next or point me to other material?
I've only used Java (So.. Spring/Guice and some other obscure library) which make things "simple" with annotations, but how does this work in Go?
I guess it's not that comparable to Java because there are no things like classes, but on a large system how are objects created and passed around?

[madoksback]

I see lots of post about using channels and goroutines to create pipelines but nobody ever talks about testing such pipelines