Learning Functional Programming in Go

Using the Reader and Writer interfaces

Let's exercise what we've learned about the io.Reader and io.Writer interfaces:

package mainimport (       "io"       "strings"       "os")type titlizeReader struct {       src io.Reader}func NewTitlizeReader(source io.Reader) *titlizeReader {       return &titlizeReader{source}}

Recall that the Reader interface looks like this:

type Reader interface {       Read(p []byte) (n int, err error)}

When we implement the Read method, our titlizeReader struct now satisfies the Reader interface:

func (t *titlizeReader) Read(p []byte) (int, error) {  count, err := t.src.Read(p)  if err != nil {     return count, err  }  for i := 0; i < len(p); i++ {     if i == 0 {        if (p[i] >= 'a' && p[i] <= 'z') {           p[i] = p[i] - 32        }     } else {        if (p[i] >= 'A' && p[i] <= 'Z' ...