Structs and methods in Go

Composite types, embedding, and receivers.

type Address struct {
    City    string
    Country string
}

type User struct {
    Name string
    Age  int
    Address
}

func (u User) Label() string {
    return u.Name + " of " + u.City
}

func (u *User) Birthday() {
    u.Age++
}

How it works

1. Embedding Address promotes its fields.
2. A value receiver reads; a pointer receiver mutates.
3. Methods attach behavior without classes.

Keywords and builtins used here

• func
• int
• return
• string
• struct
• type

The run, in numbers

Lines

18

Characters to type

209

Tokens

55

Three-star pace

95 tpm

At the three-star pace of 95 tokens a minute, this run takes about 35 seconds.

Type this snippet

Step 1 of 3 in Structs & methods, step 1 of 19 in Interfaces & generics.

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