Aprenda Go 🇧🇷 Cap. 16 – Aplicações – 4. A interface Writer
Cap. 16 – Aplicações – 4. A interface Writer Transcript and Lesson Notes
- A interface writer do pacote io. - type Writer interface { Write(p []byte) (n int, err error) } - pkg os: func (f *File) Write(b []byte) (n int, err error) - pkg json: func NewEncoder(w io.Writer) *Encoder - "Println [
Quick Summary
- A interface writer do pacote io. - type Writer interface { Write(p []byte) (n int, err error) } - pkg os: func (f *File) Write(b []byte) (n int, err error) - pkg json: func NewEncoder(w io.Writer) *Encoder - "Println [
Key Takeaways
- Review the core idea: - A interface writer do pacote io. - type Writer interface { Write(p []byte) (n int, err error) } - pkg os: func (f *File) Write(b []byte) (n int, err error) - pkg json: func NewEncoder(w io.Writer) *Encoder - "Println [
- Understand how go fits into Cap. 16 – Aplicações – 4. A interface Writer.
- Understand how golang fits into Cap. 16 – Aplicações – 4. A interface Writer.
- Understand how programacao fits into Cap. 16 – Aplicações – 4. A interface Writer.
- Understand how programar fits into Cap. 16 – Aplicações – 4. A interface Writer.
Key Concepts
Full Transcript
- A interface writer do pacote io. - type Writer interface { Write(p []byte) (n int, err error) } - pkg os: func (f *File) Write(b []byte) (n int, err error) - pkg json: func NewEncoder(w io.Writer) *Encoder - "Println [...] writes to standard output." - func Println [...] return Fprintln(os.Stdout, a...) - func Fprintln(w io.Writer, a ...interface{}) (n int, err error) - Stdout: NewFile(uintptr(syscall.Stdout), "/dev/stdout") (Google: Standard streams) - func NewFile(fd uintptr, name string) *File - func (f *File) Write(b []byte) (n int, err error) - Exemplo: - Println - Fprintln os.Stdout - io.WriteString os.Stdout - Ou: - func Dial(network, address string) (Conn, error) - type Conn interface { [...] Write(b []byte) (n int, err error) [...] }
Lesson FAQs
What is Cap. 16 – Aplicações – 4. A interface Writer about?
- A interface writer do pacote io. - type Writer interface { Write(p []byte) (n int, err error) } - pkg os: func (f *File) Write(b []byte) (n int, err error) - pkg json: func NewEncoder(w io.Writer) *Encoder - "Println [
What key concepts are covered in this lesson?
The lesson covers go, golang, programacao, programar, programação.
What should I learn before Cap. 16 – Aplicações – 4. A interface Writer?
Review the previous lessons in Aprenda Go 🇧🇷, then use the transcript and key concepts on this page to fill any gaps.
How can I practice after this lesson?
Practice by applying the main concepts: go, golang, programacao, programar.
Does this lesson include a transcript?
Yes. The full transcript is visible on this page in indexable HTML sections.
Is this lesson free?
Yes. CourseHive lessons and courses are available to learn online for free.
Continue Learning
Continue this lesson in the app
Install CourseHive on Android or iOS to keep learning while you move.
