Effective Go (Official document) notes

effective Go (Official document) Notes

2. Automatic local variable promotion (compile time complete?) ): Return &...;
4. Built-in functions:
   1. New/make
   2. Copy, append
   3. Delete
   4. Range (is this the keyword?) Because there is no back ())
6. Array is a value object
8. Slice: Referencing array
   1. 2-D slicing (slightly)
10. Map
    1. If seconds, OK: = Timezone[tz]; OK {...
12. Func (f *file) Read (buf []byte) (n int, err error) {...
    1. Note that this adds a read method to the *file type, and BUF is the outgoing parameter (slice is a reference!). ）
14. Fmt. Printf ("...%d ...", 1); C-style;
    1. Fmt. Printf (os.stdout, args, ...); C + +-style? Here, args needs to implement IO. Writer interface (serialization?) ）
    2. %v,% #v
    3. %T
16. Type MyString string
18. Switch T: = T. (type) {...//go how is run-time introspection implemented? Does this mean that each value/ref contains a type field?
20. Variable parameter: v ... interface{} ==> v ... (Do not add ...) Individual v can be considered as slice, can be applied with range operation)
22. Func Append (slice []t, elements ... T) []t
    1. Append: Cannot actually determine the type of T at run time, need compiler support at compile time (so-called builtin function)
24. Defer: Deferred until the end of the Func, even if panic (function scope, non-block)
    1. C/c++/java programmer can be understood as Func internal whole package with try{...} finally{...}?
26. Enumeration: const {_= iota \ n A B C ...}
28. Variable Group declaration: var {...}
30. Init () in each file: used to verify the initial state?
32. Sort callback: Len () int, less (i, J int) bool, Swap (i, J int)//This is equivalent to treating the sort object as a Randomaccessiterator interface in C + +?
34. Type conversions
    1. STR: = value. (string)//If the type does not match the runtime error;
36. Net/http
    1. Type Handler interface {

       servhttp (w responsewriter, req *request)

    2. = = Once you have the handler instance, register with http: http. Handle ("/path", Handler)
38. Tie a channel to Web page?
40. Extension method for Func:
    1. Type Handlerfunc func (Responsewriter, *request)
    2. Func (f Handlerfunc) servhttp (w ..., req ...) {f (W, req)}
42. _ = FD//unused, webkit/chromium often see this type of notation, unused variables are explicitly marked, unused code to be removed
44. Embedding (combination of type)
    1. The name of the other type can be added directly to the type struct, without the variable name, which is equivalent to the mixin of type traits?
46. Share by communicating
    1. Goroutines:the stack starts small (dynamically adjustable stack)-that's probably why go supports massively concurrent programs
    2. <-chan: Waiting for completion message (auto-blocking)
48. * The FOR loop variable (set to i) is reused? =
    1. Go func (I ...) { ... ) (i)//pass into the closure to generate a new copy
    2. I: = I//shadowing of the name (this feature C language is not, C + + namespace can be considered similar?) ）
50. Channels of Channels
52. Parallel: Runtime. Gomaxprocs (NCPU)
54. Panic/recover
    1. Recover executed at unwinding, i.e. defer func () {...} In

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Effective Go (Official document) notes