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| package main | |
| import ( | |
| "fmt" | |
| "log" | |
| ) | |
| // String Concatenation Monoid | |
| var identity string = "" | |
| var mappend = func(a, b string) string { | |
| return a + b | |
| } | |
| func main() { | |
| // s could be replaced with any value of type string | |
| s := "foo" | |
| identityVerified := mappend(identity, s) == s && mappend(s, identity) == s | |
| if !identityVerified { | |
| log.Fatal("invalid identity") | |
| } | |
| // a, b, and c could be any values of our given type | |
| a := "foo" | |
| b := "bar" | |
| c := "baz" | |
| associativityVerified := mappend(mappend(a, b), c) == mappend(a, mappend(b, c)) | |
| if !associativityVerified { | |
| log.Fatal("not associative") | |
| } | |
| fmt.Println("You've got a monoid") | |
| strings := []string{"Hello", " Gophers!", | |
| " Can", " I", " sell", " you", | |
| " some", " monoids?"} | |
| concatenated := identity | |
| for _, s := range strings { | |
| concatenated = mappend(concatenated, s) | |
| } | |
| fmt.Println(concatenated) | |
| } |
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