feat：开发新的方法 (#74)

ExtractKeys 切片字段提取
SliceToMap 切片转map

sliceUtil/extract_keys_test.go

@@ -0,0 +1,52 @@
+package sliceUtil
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestExtractKeysInline(t *testing.T) {
+	// 使用匿名结构体定义测试数据
+	persons := []struct {
+		ID   int
+		Name string
+	}{
+		{1, "Alice"},
+		{2, "Bob"},
+		{3, "Charlie"},
+	}
+
+	// 使用函数字面量定义 keyFunc 函数
+	keys := ExtractKeys(persons, func(p struct {
+		ID   int
+		Name string
+	}) int {
+		return p.ID
+	})
+
+	expectedKeys := []int{1, 2, 3}
+	if !reflect.DeepEqual(keys, expectedKeys) {
+		t.Errorf("Expected keys %v, but got %v", expectedKeys, keys)
+	}
+
+	// 另一个例子：使用不同的结构体和 keyFunc 函数
+	animals := []struct {
+		ID   string
+		Name string
+	}{
+		{"cat001", "Cat"},
+		{"dog002", "Dog"},
+	}
+
+	animalKeys := ExtractKeys(animals, func(a struct {
+		ID   string
+		Name string
+	}) string {
+		return a.Name
+	})
+
+	expectedAnimalKeys := []string{"Cat", "Dog"}
+	if !reflect.DeepEqual(animalKeys, expectedAnimalKeys) {
+		t.Errorf("Expected animal keys %v, but got %v", expectedAnimalKeys, animalKeys)
+	}
+}