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BUILDING BETTER
PACKAGES
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WE ALL HAVE WRITTEN
SHITTY CODE
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Code Quality
Design Effort
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IMPLEMENTATION
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IMPLEMENTATION
INTERFACE
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SIMPLICITY
FLEXIBILITY
CONTINUITY
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SIMPLICITY
FLEXIBILITY
CONTINUITY
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SIMPLICITY
FLEXIBILITY
CONTINUITY
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SIMPLICITY
FLEXIBILITY
CONTINUITY
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SIMPLICITY
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SIMPLICITY IS
PREREQUISITE FOR
RELIABILITY EDSGER DIJKSTRA
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SIMPLE MADE EASY
RICH HICKEY
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SINGULARITY
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ONE ROLE
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ONE TASK
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ONE CONCEPT
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ONE DIMENSION
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DISCOVERY
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LETTER OPENERS
AND NOT
SWISS ARMY KNIFES
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WHAT DOES IT
MEAN?
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WHAT DOES IT
ACCOMPLISH?
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WHAT DOES IT
OFFER?
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EXAMPLE:
negroni
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EXAMPLE:
Run(addr string)
ServeHTTP(rw http.ResponseWriter,
r *http.Request)
Use(h Handler)
UseHandler(h http.Handler)
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FLEXIBILITY
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COMPLIMENTS
GROWTH
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INTERFACES
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INTERFACES:
type Writer interface {
Write(p []byte) (n int, err error)
}
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INTERFACES:
type Writer interface {
Write(p []byte) (n int, err error)
}
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INTERFACES:
type FileSystem interface {
Open(name string) (File, error)
}
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INTERFACES:
type FileSystem interface {
Open(name string) (File, error)
}
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ALWAYS USE
INTERFACES
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ALWAYS USE
INTERFACES
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MOSTLY USE
INTERFACES
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INTERFACES
COMMUNICATE
CONCRETENESS
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INTERFACES
COMMUNICATE
STABILITY
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INTERFACES
COMMUNICATE
COMMITMENT
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RETURN VALUE?
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RETURN VALUE?
STRUCT
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ARGUMENT VALUE?
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ARGUMENT VALUE?
INTERFACE
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EXAMPLE:
pkg/bufio
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EXAMPLE:
NewWriter(w io.Writer) *Writer
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EXAMPLE:
NewWriter(w io.Writer) *Writer
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EXAMPLE:
NewWriter(w io.Writer) *Writer
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DISCOVERING
INTERFACES
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OS.FILE
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IO.WRITER
VS
OS.FILE
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CONTINUITY
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FICTIONAL
CONTINUITY
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THE CONSISTENCY OF THE
CHARACTERISTICS OF PERSONS,
PLOT, OBJECTS, PLACES AND
EVENTS SEEN BY THE READER OR
VIEWER
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THE CONSISTENCY OF THE
CHARACTERISTICS OF PERSONS,
PLOT, OBJECTS, PLACES AND
EVENTS SEEN BY THE READER OR
VIEWER
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HOW?
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WRITE CODE LIKE…
A MORON
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WRITE CODE LIKE…
IT ALREADY
EXISTS
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WRITE CODE LIKE…
IT’S A PART OF
THE GO STDLIB
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EXAMPLE:
gorilla/mux
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EXAMPLE:
func main() {
r := mux.NewRouter()
r.HandleFunc("/", Home)
r.HandleFunc("/products", Products)
http.Handle("/", r)
}
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EXAMPLE:
func main() {
r := mux.NewRouter()
r.HandleFunc("/", Home)
r.HandleFunc("/products", Products)
http.Handle("/", r)
}
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NEED
EXAMPLES?
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DIG INTO THE
STDLIB
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EXTEND IT!
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WE MADE IT
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SIMPLICITY
FLEXIBILITY
CONTINUITY
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- A WORLD THAT SEEMS TO HAVE BEEN GOING
ON BEFORE WE STUMBLED INTO IT BUT
WHICH, ONCE FOUND BY THE RIGHT READER,
BECOMES INDISPENSABLE TO HIM.
CS LEWIS
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@CODEGANGSTA