把两个map 合并，功能与 python 的 update 功能相同
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package main
import (
"encoding/json"
"fmt"
"reflect"
)
var jsonMergeDepth = 32
func main() {
buf1 := []byte(`{"a":1,"b":2}`)
buf2 := []byte(`{"c":3,"d":4,"a":"aaa"}`)
var m1, m2 map[string]interface{}
json.Unmarshal(buf1, &m1)
json.Unmarshal(buf2, &m2)
merged := JsonMerge(m1, m2)
fmt.Println(merged)
}
func JsonMerge(dst, src map[string]interface{}) map[string]interface{} {
return jsMerge(dst, src, 0)
}
func jsMerge(dst, src map[string]interface{}, depth int) map[string]interface{} {
if depth > jsonMergeDepth {
return dst
// panic("too deep!")
}
for key, srcVal := range src {
if dstVal, ok := dst[key]; ok {
srcMap, srcMapOk := jsMapify(srcVal)
dstMap, dstMapOk := jsMapify(dstVal)
if srcMapOk && dstMapOk {
srcVal = jsMerge(dstMap, srcMap, depth+1)
}
}
dst[key] = srcVal
}
return dst
}
func jsMapify(i interface{}) (map[string]interface{}, bool) {
value := reflect.ValueOf(i)
if value.Kind() == reflect.Map {
m := map[string]interface{}{}
for _, k := range value.MapKeys() {
m[k.String()] = value.MapIndex(k).Interface()
}
return m, true
}
return map[string]interface{}{}, false
}
注意
若有重复的key，会把原来key 值覆盖，上面代码输出：
1map[a:aaa b:2 c:3 d:4]
参考 https://github.com/peterbourgon/mergemap
本文网址: https://golangnote.com/topic/209.html 转摘请注明来源