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[go] strings.Map; generics

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David Eisinger
2023-07-18 20:18:31 -04:00
parent 1ddffe65d8
commit ec2b448d5c
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content/notes/golang/index.md
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@@ -162,6 +162,14 @@ I find [Go][1] really compelling, even though it's not super applicable to my jo
* `unicode.IsLetter` -- test if rune is a letter * `unicode.IsLetter` -- test if rune is a letter
* `strings.ContainsRune` -- test if string contains letter (`strings.ContainsRune(s[i+1:], c)`) * `strings.ContainsRune` -- test if string contains letter (`strings.ContainsRune(s[i+1:], c)`)
* `log.Println` -- print out anything (like a data structure) * `log.Println` -- print out anything (like a data structure)
* `strings.Map` -- map over a string
* `return strings.Map(func(r rune) rune { return mapping[r] }, dna)`
* Generics
* Use `[]` to define types
* `func keep[T int | []int | string](in []T, filter func(T) bool) (out []T) {`
* [Use `~` to allow "inheriting" (?) types][24]
> In Go generics, the ~ tilde token is used in the form ~T to denote the set of types whose underlying type is T.
[17]: https://stackoverflow.com/a/40951013 [17]: https://stackoverflow.com/a/40951013
[18]: https://go.dev/doc/effective_go#named-results [18]: https://go.dev/doc/effective_go#named-results
@@ -170,3 +178,4 @@ I find [Go][1] really compelling, even though it's not super applicable to my jo
[21]: https://go.dev/ref/spec#RangeClause [21]: https://go.dev/ref/spec#RangeClause
[22]: https://blog.boot.dev/golang/anonymous-structs-golang/ [22]: https://blog.boot.dev/golang/anonymous-structs-golang/
[23]: https://pkg.go.dev/time [23]: https://pkg.go.dev/time
[24]: https://stackoverflow.com/a/70890514