バッファ

sample.go

package main

import (
  "fmt"
)

func main() {
  channel := make( chan int, 2 )

  fmt.Println( "before send" )
  fmt.Println( len( channel ) )
  fmt.Println( cap( channel ) )

  channel <- 1
  channel <- 2
  // channel <- 3

  fmt.Println( "after send" )
  fmt.Println( len( channel ) )
  fmt.Println( cap( channel ) )

  fmt.Println( "received value" )
  fmt.Println( <- channel )
  fmt.Println( <- channel )
  // fmt.Println( <- channel )

  fmt.Println( "after receive" )
  fmt.Println( len( channel ) )
  fmt.Println( cap( channel ) )
}