Go basics

Package Declaration

package repositories 

• Declares that this file belongs to the repositories packages.
• Go organize code by package.
• main is the entry point package; other packages are for organization.

Import Statement

import "project/internal/models" 

• imports another package (models).
• Paths are module-relative (based on the go.mod name).

Interface Declaration

type UserRepository interface { GetAllUsers() []models.User } 

• type <Name> interface {} defines an interface.
• GetAllUsers() []models.User declares a method:
  • Returns a slice([]) of User structs from models.

Struct Definition

type userRepo struct{} 

• Defines a struct named userRepo with no fields.
• Structs in Go are like classes or objects, but without methods inline.

Constructor Function

func NewUserRepository() UserRepository { return &userRepo{} } 

• func defines a function named NewUserRepository.
• Returns a UserRepository interface.
• &userRepo{} creates a pointer to a new userRepo struct.

Method Implementation

func (r *userRepo) GetAllUsers() []models.User { return []models.User{ {ID: 1}, {ID: 2} } } 

• This is a method on the struct userRepo.
• (r *userRepo) declares a receiver (this in TS).
• Returns a hardcoded slice of User objects.