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Merge pull request #660 from szaydel/master

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Learn function decorators with Go
This commit is contained in:
Levi Bostian 2014-06-29 17:29:18 -05:00
commit f97481c6b1
1 changed files with 17 additions and 2 deletions
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15
go.html.markdown
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@ -196,6 +196,21 @@ love:
learnInterfaces() // Good stuff coming up! learnInterfaces() // Good stuff coming up!
} }
// Decorators are common in other languages. Same can be done in Go
// with function literals that accept arguments.
func learnFunctionFactory(mystring string) func(before, after string) string {
return func(before, after string) string {
return fmt.Sprintf("%s %s %s", before, mystring, after) // new string
}
}
// Next two are equivalent, with second being more practical
fmt.Println(learnFunctionFactory("summer")("A beautiful", "day!"))
d := learnFunctionFactory("summer")
fmt.Println(d("A beautiful", "day!"))
fmt.Println(d("A lazy", "afternoon!"))
func learnDefer() (ok bool) { func learnDefer() (ok bool) {
// Deferred statements are executed just before the function returns. // Deferred statements are executed just before the function returns.
defer fmt.Println("deferred statements execute in reverse (LIFO) order.") defer fmt.Println("deferred statements execute in reverse (LIFO) order.")