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`Do()` methods are called when the opration is done/redone and whose `Undo()` methods are called in reverse order when the operation is undone.\n\n`Action` is the interface that wraps the `Do()` and `Undo()` method that must be implemented for arbitrary actions:\n\n```go\ntype Action interface {\n  Do() error\n  Undo() error\n}\n```\n\n## Example\n\n[Not quite serious example with an operation that holds two actions](examples/main.go):\n\n```go\npackage main\n\nimport (\n  \"fmt\"\n\n  \"github.com/mfmayer/undostack\"\n)\n\n// Implement welcome action\ntype welcomeAction struct{}\n\nfunc (wa *welcomeAction) Do() error {\n  fmt.Println(\"Welcome my friend.\")\n  return nil\n}\n\nfunc (wa *welcomeAction) Undo() error {\n  fmt.Println(\"Go away, I don't like you.\")\n  return nil\n}\n\n// Implement action to offer a seat\ntype offerSeatAction struct{}\n\nfunc (sfa *offerSeatAction) Do() error {\n  fmt.Println(\"Please have a seat.\")\n  return nil\n}\n\nfunc (sfa *offerSeatAction) Undo() error {\n  fmt.Println(\"Please stand up.\")\n  return nil\n}\n\nfunc main() {\n  // initalize the undo stack\n  undoStack := undostack.UndoStack{}\n\n  // create the receive operation and add the actions welcome and offer a seat\n  receiveOperation := undostack.Operation{\n    Name: \"Receive Guest\",\n    Actions: []undostack.Action{\n      \u0026welcomeAction{},\n      \u0026offerSeatAction{},\n    },\n  }\n\n  // Do, Undo and Redo the opearion\n  fmt.Println(\"# Do receive:\")\n  undoStack.Do(\u0026receiveOperation)\n\n  fmt.Println(\"\\n# Undo receive:\")\n  undoStack.Undo()\n\n  fmt.Println(\"\\n# Redo receive:\")\n  undoStack.Redo()\n}\n```\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmfmayer%2Fundostack","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmfmayer%2Fundostack","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmfmayer%2Fundostack/lists"}