kenken64/golangbyexample

Chapter 1

Make map

https://blog.golang.org/maps

m := make(map[string]int)

Short hand declaration

m := 0.0

Underscore (Blank identifier)

_, err := test()

Channel operator <- arrow

ch chan<-string

ch <- v    // Send v to channel ch.
v := <-ch  // Receive from ch, and
           // assign value to v.

Chapter 2

Keyword

break       default     func    interface   select
case        defer       go      map         struct
chan        else        goto    package     switch
const       fallthorugh if      range       type
continue    for         import  return      var

Constants

true false iota nil

Types

int int8 int16 int32 int64
uint uint8 uint16 uint32 uint64 uintptr
float32 float64 complex128 complex64
bool byte rune string error

Functions

make len cap new append copy close delete
complex real imag
panic recover

Pointers

x:=1
p:=&x
fmt.Printf(*p)
*p= 2
fmt.Printf(x)

fmt printF arg

fmt (Args)	Describe
%d	decimal integer
%x,	%o, %b integer in hexadecimal, octal, binary
%f,	%g, %e floating-point number: 3.141593 3.141592653589793 3.141593e+00
%t	boolean: true or false
%c	rune (Unicode code point)
%s	string
%q	quoted string "abc" or rune 'c'
%v	any value in a natural format
%T	type of any value
%%	literal percent sign (no operand)