Golang : Reset buffer example
There are two ways to reset a buffer that with content ( length not equal zero ). You can use either Reset()
or Truncate()
methods found in the bytes.NewBuffer()
function. The following example demonstrates how to create a buffer, check the size and capacity before and after clearing the buffer content.
package main
import (
"bytes"
"fmt"
)
func main() {
buffer := bytes.NewBuffer([]byte("abcdefghijkl"))
// convert buffer to bytes and to string for println
fmt.Println("Before reset : ", string(buffer.Bytes()))
fmt.Printf("Buffer's Length %d and capacity %d \n", len(buffer.Bytes()), cap(buffer.Bytes()))
buffer.Reset()
fmt.Println("After reset : ", string(buffer.Bytes()))
fmt.Printf("Buffer's Length %d and capacity %d \n", len(buffer.Bytes()), cap(buffer.Bytes()))
buffer2 := bytes.NewBuffer([]byte("mnopqrstuvwxyz"))
fmt.Println("Before truncate(0) : ", string(buffer2.Bytes()))
fmt.Printf("Buffer 2's Length %d and capacity %d \n", len(buffer2.Bytes()), cap(buffer2.Bytes()))
// alternate way to reset buffer
buffer2.Truncate(0)
fmt.Println("After truncate(0) : ", string(buffer2.Bytes()))
fmt.Printf("Buffer 2's Length %d and capacity %d \n", len(buffer2.Bytes()), cap(buffer2.Bytes()))
}
Output :
Before reset : abcdefghijkl
Buffer's Length 12 and capacity 32
After reset :
Buffer's Length 0 and capacity 32
Before truncate(0) : mnopqrstuvwxyz
Buffer 2's Length 14 and capacity 32
After truncate(0) :
Buffer 2's Length 0 and capacity 32
References :
https://www.socketloop.com/references/golang-bufio-reset-function-example
https://www.socketloop.com/references/golang-bytes-buffer-truncate-function-example
By Adam Ng
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