Created
August 11, 2014 20:33
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Empty things in json
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| package main | |
| import ( | |
| "encoding/json" | |
| "fmt" | |
| ) | |
| type Book struct { | |
| Title string `json:"title,omitempty"` | |
| Author string `json:"author,omitempty"` | |
| ISBN string `json:"isbn,omitempty"` | |
| } | |
| type Library struct { | |
| Name string `json:"name,omitempty"` | |
| Books []Book `json:"books,omitempty"` | |
| BestBook Book `json:"bestbook,omitempty"` | |
| } | |
| type StructWithString struct { | |
| Name string `json:"name,omitempty"` | |
| } | |
| type StructWithStringPointer struct { | |
| Name *string `json:"name,omitempty"` | |
| } | |
| type StructWithSlice struct { | |
| Name []string `json:"name,omitempty"` | |
| } | |
| type InnerStruct struct { | |
| Something string `json:"something,omitempty"` | |
| } | |
| type OuterStruct struct { | |
| Field InnerStruct `json:"field,omitempty"` | |
| } | |
| type OuterStructWithPointer struct { | |
| Field *InnerStruct `json:"field,omitempty"` | |
| } | |
| func main() { | |
| book := Book{Title: "The hard thing about hard things", Author: "Ben Horowitz"} | |
| jsonbook, err := json.Marshal(book) | |
| if err != nil { | |
| fmt.Printf("Error Marshaling book to json:%v\n", err) | |
| } else { | |
| fmt.Println(string(jsonbook)) | |
| } | |
| // ------------------------------------------------------ | |
| library := Library{Name: "Ali's Library"} | |
| jsonlib, err := json.Marshal(library) | |
| if err != nil { | |
| fmt.Printf("Error Marshaling library to json:%v\n", err) | |
| } else { | |
| fmt.Println(string(jsonlib)) | |
| } | |
| s := fmt.Sprintf("%s", string(jsonlib)) | |
| var libback Library | |
| err = json.Unmarshal([]byte(s), &libback) | |
| if err != nil { | |
| fmt.Printf("Error UnMarshalling library: %v\n", err) | |
| } else { | |
| fmt.Printf("Library Back is: %v\n", libback) | |
| } | |
| //// --------------------------------------- | |
| stjson, err := json.Marshal(StructWithString{}) | |
| if err != nil { | |
| fmt.Printf("Error Marshaling to json:%v\n", err) | |
| } else { | |
| fmt.Println(string(stjson)) | |
| } | |
| stjson, err = json.Marshal(StructWithStringPointer{}) | |
| if err != nil { | |
| fmt.Printf("Error Marshaling to json:%v\n", err) | |
| } else { | |
| fmt.Println(string(stjson)) | |
| } | |
| stjson, err = json.Marshal(StructWithSlice{}) | |
| if err != nil { | |
| fmt.Printf("Error Marshaling to json:%v\n", err) | |
| } else { | |
| fmt.Println(string(stjson)) | |
| } | |
| stjson, err = json.Marshal(OuterStruct{}) | |
| if err != nil { | |
| fmt.Printf("Error Marshaling to json:%v\n", err) | |
| } else { | |
| fmt.Println(string(stjson)) | |
| } | |
| stjson, err = json.Marshal(OuterStruct{}) | |
| if err != nil { | |
| fmt.Printf("Error Marshaling to json:%v\n", err) | |
| } else { | |
| fmt.Println(string(stjson)) | |
| } | |
| } |
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