The understanding of Chan in Go _go

The classification of Chan

Divided into 2 categories with cache and no caching, especially the use of caching, to prevent the pit from falling.

With no cache
Make (Chan data type)

With cache
Make (Chan data type, length)

For example, define a chan:ch with caching: = Make (chan int,2)
Here we define a 2-cache-Length Chan, when we have written 2 data to Chan, blocking is sent when the third data is written again, until others read the data from the Chan, so that the data can be written again, and the cached Chan resembles a queue, The data cannot be written when the queue is full.
3. Chan's closure
Chan can close with close, and the closed Chan is unable to write data, but can read data.