make use of maps.Copy and maps.Clone

Author: itchyny

cli/test.yaml

@@ -2948,6 +2948,16 @@
     ""
     ""
 
+- name: add objects
+  args:
+    - -c
+    - '.[0] + .[]'
+  input: '[{"a": 1}, {"b": 2}, {"a": 3}]'
+  expected: |
+    {"a":1}
+    {"a":1,"b":2}
+    {"a":3}
+
 - name: multiply objects
   args:
     - -c

func.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"maps"
 	"math"
 	"math/big"
 	"net/url"
@@ -489,16 +490,10 @@ func funcAdd(v any) any {
 		case map[string]any:
 			switch w := v.(type) {
 			case nil:
-				m := make(map[string]any, len(x))
-				for k, e := range x {
-					m[k] = e
-				}
-				v = m
+				v = maps.Clone(x)
 				continue
 			case map[string]any:
-				for k, e := range x {
-					w[k] = e
-				}
+				maps.Copy(w, x)
 				continue
 			}
 		}
@@ -1664,9 +1659,7 @@ func updateObject(v map[string]any, k string, path []any, n any, a allocator) (a
 		return v, nil
 	}
 	w := a.makeObject(len(v) + 1)
-	for k, v := range v {
-		w[k] = v
-	}
+	maps.Copy(w, v)
 	w[k] = u
 	return w, nil
 }

operator.go

@@ -1,6 +1,7 @@
 package gojq
 
 import (
+	"maps"
 	"math"
 	"math/big"
 	"strings"
@@ -334,12 +335,8 @@ func funcOpAdd(_, l, r any) any {
 				return l
 			}
 			m := make(map[string]any, len(l)+len(r))
-			for k, v := range l {
-				m[k] = v
-			}
-			for k, v := range r {
-				m[k] = v
-			}
+			maps.Copy(m, l)
+			maps.Copy(m, r)
 			return m
 		},
 		func(l, r any) any {
@@ -416,9 +413,7 @@ func funcOpMul(_, l, r any) any {
 
 func deepMergeObjects(l, r map[string]any) any {
 	m := make(map[string]any, len(l)+len(r))
-	for k, v := range l {
-		m[k] = v
-	}
+	maps.Copy(m, l)
 	for k, v := range r {
 		if mk, ok := m[k]; ok {
 			if mk, ok := mk.(map[string]any); ok {