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
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+5.2k Golang : Debug with Godebug
+11.1k Golang : How to parse plain email text and process email header?
+13.3k Golang : Find network of an IP address
+8.7k Golang : Turn string or text file into slice example
+33.1k Golang : Integer is between a range
+50.2k Golang : Check if item is in slice/array
+9.2k Golang : Embed secret text string into binary(executable) file
+6.7k Setting $GOPATH environment variable for Unix/Linux and Windows
+18.2k Golang : Delete item from slice based on index/key position
+5.7k Golang : Calculate pivot points for a cross
+26.2k Golang : Record voice(audio) from microphone to .WAV file
+9.2k Golang : cannot assign type int to value (type uint8) in range error