Mastering Go - Second Edition

Reading a text file character by character

In this section, you will learn how to read a text file character by character, which is a pretty rare requirement unless you want to develop a text editor. The relevant Go code will be saved as byCharacter.go, which will be presented in four parts.

The first part of byCharacter.go is shown in the following Go code:

package main 
 
import ( 
    "bufio" 
    "flag" 
    "fmt" 
    "io" 
    "os" 
) 

As you can see, you will not need to use regular expressions for this task.

The second code segment from byCharacter.go is as follows:

func charByChar(file string) error { var err error f, err := os.Open(file) if err != nil { return err } defer f.Close() r := bufio.NewReader(f) for { line, err := r.ReadString('\n') if err == io.EOF ...