github.com/shogo82148/std@v1.22.1-0.20240327122250-4e474527810c/encoding/json/example_marshaling_test.go (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package json_test
     6  
     7  import (
     8  	"github.com/shogo82148/std/encoding/json"
     9  	"github.com/shogo82148/std/fmt"
    10  	"github.com/shogo82148/std/log"
    11  )
    12  
    13  const (
    14  	Unknown Animal = iota
    15  	Gopher
    16  	Zebra
    17  )
    18  
    19  func Example_customMarshalJSON() {
    20  	blob := `["gopher","armadillo","zebra","unknown","gopher","bee","gopher","zebra"]`
    21  	var zoo []Animal
    22  	if err := json.Unmarshal([]byte(blob), &zoo); err != nil {
    23  		log.Fatal(err)
    24  	}
    25  
    26  	census := make(map[Animal]int)
    27  	for _, animal := range zoo {
    28  		census[animal] += 1
    29  	}
    30  
    31  	fmt.Printf("Zoo Census:\n* Gophers: %d\n* Zebras:  %d\n* Unknown: %d\n",
    32  		census[Gopher], census[Zebra], census[Unknown])
    33  
    34  	// Output:
    35  	// Zoo Census:
    36  	// * Gophers: 3
    37  	// * Zebras:  2
    38  	// * Unknown: 3
    39  }