Once

A simple library to do something exactly once.

Prerequisites

• Go >= 1.21

Install

go get go.nhat.io/once

Types

Type	Description
Once	An alias of sync.Once.
Func	A function that can be executed exactly once.
Value	A function that returns value can be executed exactly once.
Values	A function that returns values can be executed exactly once.
FuncMap	A map of functions that can be executed exactly once.
ValueMap	A map of functions that return value can be executed exactly once.
ValuesMap	A map of functions that return values can be executed exactly once.
LazyValueMap	A map contains values that are initialized on the first access.

Examples

package once_test

import (
    "fmt"

    "go.nhat.io/once"
)

func ExampleLazyValueMap() {
    type Person struct {
        ID   string
        Name string
    }

    people := once.LazyValueMap[string, *Person]{
        New: func(key string) *Person {
            return &Person{ID: key}
        },
    }

    instance1 := people.Get("1")
    instance2 := people.Get("1")

    fmt.Println(instance2.Name)

    instance1.Name = "John Doe"

    fmt.Println(instance2.Name)

    // Output:
    //
    // John Doe
}

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