Tuple type

[sabouaram]

Proposal Details

Hello Gophers,
We propose the implementation of a tuple type in Golang, which allows for the creation of a collection of elements of different types. The tuple type provides several advantages, including the ability to store and retrieve heterogeneous data, iterate over its elements, and obtain the type information of each element.

An example of the tuple type:

package main

import (
	"fmt"
	"reflect"
)

type tuple struct {
	elements []any
}

type tupleElement struct {
	elemindex int
	elemvalue any
	elemtype  reflect.Type
}

func Tuple(elements ...any) *tuple {
	return &tuple{elements: elements}
}

func (t *tuple) len() int {
	return len(t.elements)
}

func (t *tuple) get(index int) (any, reflect.Type) {
	if index < 0 || index >= len(t.elements) {
		panic("index out of range")
	}
	return t.elements[index], reflect.TypeOf(t.elements[index])
}

func (t *tuple) valueAt(index int) any {
	value, _ := t.get(index)
	return value
}

func (t *tuple) typeAt(index int) reflect.Type {
	_, typ := t.get(index)
	return typ
}

func (t *tuple) Iterate() <-chan tupleElement {
	ch := make(chan tupleElement)
	go func() {
		for i, elem := range t.elements {
			ch <- tupleElement{i, elem, reflect.TypeOf(elem)}
		}
		close(ch)
	}()
	return ch
}

func (t *tuple) String() string {
	result := "tuple{"
	for i, elem := range t.elements {
		result += fmt.Sprintf("%v (type: %s)", elem, reflect.TypeOf(elem))
		if i < len(t.elements)-1 {
			result += ", "
		}
	}
	result += "}"
	return result
}

// //////////////////////////////////////////////Example////////////////////////////////////////////////////////////////
func main() {

	t := Tuple("Alice", 30, "Engineer", true, 42.0, struct { a int ; b string }{ 4 , "hello" } )

	fmt.Printf("t[0] = %v (type: %s)\n", t.valueAt(0), t.typeAt(0))
	fmt.Printf("t[1] = %v (type: %s)\n", t.valueAt(1), t.typeAt(1))

	for elem := range t.Iterate() {
		fmt.Printf("t[%d] = %v (type: %s)\n", elem.elemindex, elem.elemvalue, elem.elemtype)
	}

	fmt.Println(t)

}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

[gabyhelp]

Similar Issues

• proposal: Tuple Types for Go #64457
• proposal: Go 2: tuples as sugar for structs #63221
• proposal: Go 2: add tuple type #61920

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[seankhliao]

I'm going to close this as a dupe of the above.