example_test.go

package round_test

import (
	"encoding/json"
	"fmt"

	"github.com/portfoliotree/round"
)

type Rates struct {
	SomeRate float64 `precision:"2,percent"`
}

type Data struct {
	Number   float64
	Map      map[string]float64 `precision:"3"`
	Embedded Rates
	List     []float64
}

func (d Data) String() string {
	buf, err := json.MarshalIndent(d, "", "\t")
	if err != nil {
		panic(err)
	}
	return string(buf)
}

func Example() {
	data := Data{
		Number: 1.1111,
		Map: map[string]float64{
			"4.5555555": 4.5555555,
			"4.4444444": 4.4444444,
		},
		Embedded: Rates{SomeRate: 0.998765},
		List:     []float64{7, 6.656},
	}

	fmt.Printf("before: %s\n", data.String())

	_ = round.Recursive(&data, 2)

	fmt.Printf("after:  %s", data.String())

	// Output: before: {
	// 	"Number": 1.1111,
	// 	"Map": {
	// 		"4.4444444": 4.4444444,
	// 		"4.5555555": 4.5555555
	// 	},
	// 	"Embedded": {
	// 		"SomeRate": 0.998765
	// 	},
	// 	"List": [
	// 		7,
	// 		6.656
	// 	]
	// }
	// after:  {
	// 	"Number": 1.11,
	// 	"Map": {
	// 		"4.4444444": 4.444,
	// 		"4.5555555": 4.556
	// 	},
	// 	"Embedded": {
	// 		"SomeRate": 99.88
	// 	},
	// 	"List": [
	// 		7,
	// 		6.66
	// 	]
	//}
}