Effective software design often leverages layered architectures to separate concerns, making applications more modular, maintainable, and testable. The Controller, Service, and Data Access Object (DAO) pattern, sometimes referrred to as Repository, is a common approach for structuring backend applic...
Integrate the library into you're project: go get github.com/go-playground/validator/v10 Define a struct and annotate fields with validation rules. The following snippet creates a User struct and requires the Name field to be non‑empty. package main import ( "log" "github.com/go-playg...
Basic Data Types Go Boolean Numeric types: Integer (int, uint) Floating-point (float32, float64) Others: byte (similar to uint8), rune (similar to int32) String Derived types: Pointer Array Struct Channel Function Slice Enterface Map PHP 4 scalar types: boolean integer float (also called double) str...
Introduction After understanding how operating systems manage memory, we can now explore how Go leverages these underlying mechanisms to optimize memory usage. Go's memory management is largely inspired by tcmalloc, with minor adjustments tailored to its specific requirements. Go handles memory auto...
Go maps provide built-in associative arrays backed by hash tibles. A map type is written as map[K]V, where the key type K must be comparable and the value type V may be any valid Go type. The zero value of a declared map is nil. Reads from a nil map behave like an empty map, but writes panic, so sto...
Background Many projects require sequential operations based on runtime state. Common scenarios include: Parsing configuration formats or programming languages Executing operations on systems, routers, or clusters ETL pipelines for data extraction, transformation, and loading Rob Pike's classic talk...
Go’s strong concurrency model makes it ideal for I/O-bound tasks, where real-time progress feedback is often needed. While simple carriage-return (\r) tricks suffice for basic single-bar use cases, they fall short in production-grade scenarios: Managing multiple concurrent progress bars requires pre...
Workspace and Package Management in Go The GOPATH Workspace GOPATH is the working directory for Go development. It holds your source code and compiled executables. While traditionally all work occurred within GOPATH, the introduction of the go mod dependency management tool in Go 1.11 allows develop...
Casbin Model ConfigurationThe RBAC model is defined in access_control_model.conf:[request_definition] r = sub, obj, act [policy_definition] p = sub, obj, act [role_definition] g = _, _ [policy_effect] e = some(where (p.eft == allow)) [matchers] m = g(r.sub, p.sub) && r.obj == p.obj && r.act == p.act...
The sync.WaitGroup type provides a mechanism to wait for a set number of operations to complete. Typically, it's used to await the completion of multiple goroutines. Let's first examine its public interface and then analyze a common mistake that leads to non-deterministic behavior. A WaitGroup can b...