清澄秋爽

package main

import "fmt"


func main(){

	a := []byte("0123456789")

	fmt.Printf("[a_src] len: %v\n", len(a))
	fmt.Printf("[a_src] cap: %v\n", cap(a))

	b := make([]byte, 5)
	copy(b, a[:5])
	fmt.Printf("[b_cpy] len: %v\n", len(b))
	fmt.Printf("[b_cpy] cap: %v\n", cap(b))

	a = a[:5]

	fmt.Printf("[a_dst] len: %v\n", len(a))
	fmt.Printf("[a_dst] cap: %v\n", cap(a))


}