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Constructors deconstructed [best practice]

 3 years ago
source link: https://yourbasic.org/golang/constructor-best-practice/
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Constructors deconstructed [best practice]

yourbasic.org/golang

Go doesn't have explicit constructors. The idiomatic way to set up new data structures is to use proper zero values coupled with factory functions.

factory-conveyor-belt.jpg

Zero value

Try to make the default zero value useful and document its behavior. Sometimes this is all that’s needed.

// A StopWatch is a simple clock utility.
// Its zero value is an idle clock with 0 total time.
type StopWatch struct {
    start   time.Time
    total   time.Duration
    running bool
}

var clock StopWatch // Ready to use, no initialization needed.
  • StopWatch takes advantage of the useful zero values of time.Time, time.Duration and bool.
  • In turn, users of StopWatch can benefit from its useful zero value.

Factory

If the zero value doesn’t suffice, use factory functions named NewFoo or just New.

scanner := bufio.NewScanner(os.Stdin)
err := errors.New("Houston, we have a problem")

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