`io.WriteString vs. ResponseWriter.Write: Which Should I Use for Writing Strings in Go?`

Difference between ResponseWriter.Write and io.WriteString

io.Writer

• An io.Writer interface represents a target to which sequences of bytes can be written.
• Specific implementations, like http.ResponseWriter and files, implement this interface.

WriteString

• A WriteString method exists for types implementing io.Writer.
• It allows writing strings directly, potentially avoiding conversion overhead.
• It checks if the io.Writer has a WriteString method and uses it if available, otherwise it converts the string to bytes before writing.

fmt.Fprintf

• fmt.Fprintf is a convenient function that combines formatting and writing to an io.Writer.
• It expects a format string that specifies how to format the written values.

Best Practice

• For writing strings: Use io.WriteString for improved performance. It will use the WriteString method if available, or convert to bytes if not.
• For formatted output: Use fmt.Fprintf to easily format and write complex values.

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