json.Marshal(struct) returns “{}”

Question

type TestObject struct {
    kind string `json:\"kind\"`
    id   string `json:\"id, omitempty\"`
    name  string `json:\"name\"`
    email string `json:\"email\"`
         


        

Answer 1

• When the first letter is capitalised, the identifier is public to any piece of code that you want to use.
• When the first letter is lowercase, the identifier is private and could only be accessed within the package it was declared.

Examples

 var aName // private

 var BigBro // public (exported)

 var 123abc // illegal

 func (p *Person) SetEmail(email string) {  // public because SetEmail() function starts with upper case
    p.email = email
 }

 func (p Person) email() string { // private because email() function starts with lower case
    return p.email
 }