From 9377182985cdd7424a219ff6709835a7be2b875a Mon Sep 17 00:00:00 2001
From: azw <vcl_delphi@126.com>
Date: Sat, 19 Aug 2023 20:52:10 +0800
Subject: [PATCH] 1

---
 functional.go | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++
 sysutils.go   |  4 ++++
 2 files changed, 67 insertions(+)
 create mode 100644 functional.go

diff --git a/functional.go b/functional.go
new file mode 100644
index 0000000..26b0ff9
--- /dev/null
+++ b/functional.go
@@ -0,0 +1,63 @@
+package q5
+
+func Map[T any](arr []T, cb func(T) T) []T {
+	newList := []T{}
+	for _, val := range arr {
+		newList = append(newList, cb(val))
+	}
+	return newList
+}
+
+func Reduce[T any](arr []T, cb func(T, T) T, initVal *T) T {
+	var result T
+	if initVal != nil {
+		result = *initVal
+	}
+	if len(arr) > 0 {
+		if initVal == nil {
+			result = arr[0]
+			for i := 1; i < len(arr); i++ {
+				result = cb(result, arr[i])
+			}
+		} else {
+			for i := 0; i < len(arr); i++ {
+				result = cb(result, arr[i])
+			}
+		}
+	}
+	return result
+}
+
+func Filter[T any](arr []T, cb func(T) bool) []T {
+	newList := []T{}
+	for _, val := range arr {
+		if cb(val) {
+			newList = append(newList, val)
+		}
+	}
+	return newList
+}
+
+func Max[T string | int | int32 | int64 | float32 | float64](a T, b T) T {
+	if a < b {
+		return b
+	} else {
+		return a
+	}
+}
+
+func Min[T string | int | int32 | int64 | float32 | float64](a T, b T) T {
+	if a < b {
+		return a
+	} else {
+		return b
+	}
+}
+
+func ToInterfaces[T any](values []T) []interface{} {
+	result := []interface{}{}
+	for _, val := range values {
+		result = append(result, val)
+	}
+	return result
+}
diff --git a/sysutils.go b/sysutils.go
index 17eb523..969800d 100644
--- a/sysutils.go
+++ b/sysutils.go
@@ -130,3 +130,7 @@ func FormatUnixDateEx(sec int64) string {
 	strTime := time.Unix(sec, 0).Format("20060102")
 	return strTime
 }
+
+func TraverseSlice[T any](arr []T, cb func (T)) {
+
+}