Proposal : Str : string type wrapper to enable python-like string methods chaining : s.ReplaceAll("i", "r").Capitalize()

[serge-hulne]

Proposal

Aim : provide a type of strings (Str) which enables python-like string methods chaining as in:

s : = Str{"Hello Woild"}
s.ReplaceAll("i", "r").Capitalize()   //-> HELLO WORLD

Background

The motivations are:

• Emulate the conciseness, expressivity of chaining Python strings.
• Provide user with a string object which is familiar to Python, JS, TS, C++, Swift, etc. users.

Workarounds

Exemple of implementation:

package str

import "strings"

type Str struct {
	Str string
}

func New(s string) Str {
	return Str{s}
}

func (s Str) String() string {
	return s.Str
}

func (s *Str) Capitalize() *Str {
	s.Str = strings.ToUpper(s.Str)
	return s
}
func (s *Str) ReplaceAll(c1 string, c2 string) *Str {
	s.Str = strings.Replace(s.Str, c1, c2, -1)
	return s
}

Exemple of use:

// Testing Str:
s := Str{"Hello Woild"}
fmt.Printf("%s\n", s.ReplaceAll("i", "r").Capitalize())
println(s.ReplaceAll("i", "r").Capitalize().Str)

Alternative implementation (immutable Str strings):

package str

import "strings"

type Str struct {
	Str string
}

func New(s string) Str {
	return Str{s}
}

func (s Str) String() string {
	return s.Str
}

func (s Str) Capitalize() Str {
	s.Str = strings.ToUpper(s.Str)
	return s
}

func (s Str) ReplaceAll(c1 string, c2 string) Str {
	s.Str = strings.Replace(s.Str, c1, c2, -1)
	return s
}

[xushiwei]

This feature is supported already.

[xushiwei]

s := "Hello world???"
println s.replaceAll("?", "!").toTitle // HELLO WORLD!!!