Golang bytes.Buffer Examples (WriteString, Fprintf)

Use bytes.Buffer to write and store byte data. Call WriteString and fmt.Fprintf.

Bytes.Buffer. Often we want to build up a long sequence of bytes. With bytes.Buffer we can write bytes into a single buffer, and then convert to a string when we are done.

For performance, using bytes.Buffer is an ideal choice. And it can simplify some situations where we want to append many values together.

WriteString. A simple way to append data to a bytes.Buffer is to call WriteString. We must pass a string to this func. We can call it many times in a loop.

String: To convert the Buffer into a string, we can invoke the String() func. This string can then be printed to the console.

Golang program that uses bytes.Buffer, WriteString package main import ( "bytes" "fmt" ) func main() { // New Buffer. var b bytes.Buffer // Write strings to the Buffer. b.WriteString("ABC") b.WriteString("DEF") // Convert to a string and print it. fmt.Println(b.String()) } Output ABCDEF

Fprintf. We can use fmt.Fprintf to append things like numbers to a bytes buffer. A format string is passed as the second argument of Fprintf.

Note: For performance, using Fprintf will not be ideal—appending bytes directly, with no intermediate format step, would be faster.

Tip: We must pass a pointer reference to the bytes.Buffer as the first argument to Fprintf.

Golang program that uses Fprintf with bytes.Buffer package main import ( "bytes" "fmt" ) func main() { var b bytes.Buffer // Use Fprintf with Buffer. fmt.Fprintf(&b, "A number: %d, a string: %v\n", 10, "bird") b.WriteString("[DONE]") // Done. fmt.Println(b.String()) } Output A number: 10, a string: bird [DONE]

A summary. For appending large amounts of byte data into a single target buffer, the bytes.Buffer type is a good choice. We can use it with methods like WriteString and Fprintf.

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Golang bytes.Buffer Examples (WriteString, Fprintf)

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