README.md

GoCast

Introduction

GoCast is a powerful Go library that allows you to easily convert between different basic types in a consistent and efficient way. Whether you need to convert strings, numbers, or other basic types, GoCast has got you covered.

Features

• Universal Type Casting: GoCast provides a set of methods for universal type casting, making it easy to convert data between various types.
• Struct Field Manipulation: GoCast allows you to set and retrieve values of struct fields dynamically, making it a valuable tool for working with complex data structures.
• Custom Type Support: You can define custom types and implement your own conversion logic, giving you full control over how data is cast.

Installation

To use GoCast in your Go project, simply import it:

import "github.com/demdxx/gocast/v2"

Usage Example

Here are some examples of how you can use GoCast:

// Example string casting:
gocast.Str("strasstr")           // "strasstr"
gocast.Str(8)                    // "8"
gocast.Str(8.31)                 // "8.31"
gocast.Str([]byte("one time"))   // "one time"
gocast.Str(nil)                  // ""

// Example number casting:
gocast.Number[int](8)            // 8
gocast.Number[int](8.31)         // 8
gocast.Number[int]("8")          // 8
gocast.Number[int](true)         // 1
gocast.Number[int](false)        // 0

var eight any = 8
gocast.Number[int](eight)        // 8
gocast.Cast[int](eight)          // 8
gocast.Number[int](nil)          // 0

// Number converts only into numeric values (simpler and faster then Cast)
gocast.Number[float32]("2.12")   // 2.12

// Cast converts any type to any other type
gocast.Cast[float64]("2.")       // 2.0

val, err := gocast.TryCast[int]("123.2") // 123, <nil>

res := gocast.Map[string, any](struct{ID int64}{ID: 1}) // map[string]any{"ID": 1}

func sumAll(vals ...any) int {
  var result int = 0
  for _, v := range vals {
    result += gocast.Number[int](v)
  }
  return result
}

Struct Field Manipulation

GoCast also allows you to work with struct fields dynamically:

type User struct {
  ID    uint64
  Email string
}

var user User

// Set structure values
err := gocast.SetStructFieldValue(&user, "ID", uint64(19))
err := gocast.SetStructFieldValue(&user, "Email", "[email protected]")

id, err := gocast.StructFieldValue(user, "ID")
email, err := gocast.StructFieldValue(user, "Email")
fmt.Printf("User: %d - %s", id, email)
// > User: 19 - [email protected]

Custom Type Support

You can define and use custom types with GoCast:

// Define custom type
type Money int64

func (m *Money) CastSet(ctx context.Context, v any) error {
  switch val := v.(type) {
  case Money:
    *m = val
  default:
    *m = Money(gocast.Float64(v) * 1000000)
  }
  return nil
}

// Use custom type in structs
type Car struct {
  ID int64
  Price Money
}

var car Car

// Mapping values into struct
gocast.TryCopyStruct(&car, map[string]any{"ID":1, "Price": "12000.00"})

Benchmarks

Here are some benchmark results for GoCast:

> go test -benchmem -v -race -bench=.

goos: darwin
goarch: amd64
pkg: github.com/demdxx/gocast/v2
BenchmarkApproachTest
BenchmarkApproachTest/bench1
BenchmarkApproachTest/bench1-24           348097         3064 ns/op        0 B/op          0 allocs/op
BenchmarkApproachTest/bench2
BenchmarkApproachTest/bench2-24           394160         3005 ns/op        0 B/op          0 allocs/op
BenchmarkBool
BenchmarkBool-24                        20453542           58.87 ns/op             0 B/op          0 allocs/op
BenchmarkToBoolByReflect
BenchmarkToBoolByReflect-24             17354990           70.62 ns/op             0 B/op          0 allocs/op
BenchmarkToFloat
BenchmarkToFloat-24                     10951923          107.0 ns/op              0 B/op          0 allocs/op
BenchmarkToInt
BenchmarkToInt-24                        9870794          121.1 ns/op              0 B/op          0 allocs/op
BenchmarkToUint
BenchmarkToUint-24                       9729873          121.3 ns/op              0 B/op          0 allocs/op
BenchmarkToStringByReflect
BenchmarkToStringByReflect-24             922710         1601 ns/op        5 B/op          0 allocs/op
BenchmarkToString
BenchmarkToString-24                      836929         1622 ns/op        5 B/op          0 allocs/op
BenchmarkGetSetFieldValue
BenchmarkGetSetFieldValue/set
BenchmarkGetSetFieldValue/set-24         1000000         1021 ns/op       64 B/op          4 allocs/op
BenchmarkGetSetFieldValue/get
BenchmarkGetSetFieldValue/get-24         1869465          643.8 ns/op             48 B/op          3 allocs/op
BenchmarkParseTime
BenchmarkParseTime-24                     374346         3130 ns/op      700 B/op         17 allocs/op
BenchmarkIsEmpty
BenchmarkIsEmpty-24                     37383031           31.23 ns/op             0 B/op          0 allocs/op
PASS
ok      github.com/demdxx/gocast/v2     17.982s

License

GoCast is released under the MIT License. See the LICENSE file for details.