v1.16.12

Added:
* slicesx:
** Last
** LastIndex

slicesx/funcs_test.go

@@ -0,0 +1,235 @@
+package slicesx
+
+import (
+	"testing"
+)
+
+func TestLast(t *testing.T) {
+
+	var v any
+	var e any
+	var intSl []int
+	var strSl []string
+	var boolSl []bool
+	var anySl []any
+
+	/*
+		int
+	*/
+	// nil
+	v = Last(intSl)
+	e = 0
+	if v != e {
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+	// empty
+	intSl = make([]int, 0)
+	v = Last(intSl)
+	if v != e { // still expect 0
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+	// populated
+	intSl = []int{0, 1, 2, 3}
+	v = Last(intSl)
+	e = 3
+	if v != e {
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+
+	/*
+		string
+	*/
+	// nil
+	v = Last(strSl)
+	e = ""
+	if v != e {
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+	// empty
+	strSl = make([]string, 0)
+	v = Last(strSl)
+	if v != e { // still expect ""
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+	// populated
+	strSl = []string{"a", "b", "c"}
+	v = Last(strSl)
+	e = "c"
+	if v != e {
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+
+	/*
+		bool
+	*/
+	// nil
+	v = Last(boolSl)
+	e = false
+	if v != e {
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+	// empty
+	boolSl = make([]bool, 0)
+	v = Last(boolSl)
+	if v != e { // still expect false
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+	// populated
+	boolSl = []bool{true, false, true, false, true}
+	v = Last(boolSl)
+	e = true
+	if v != e {
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+
+	/*
+		any/interface{}
+	*/
+	// nil
+	v = Last(anySl)
+	e = nil
+	if v != e {
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+	// empty
+	anySl = make([]any, 0)
+	v = Last(anySl)
+	if v != e { // still expect nil
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+	// populated
+	anySl = []any{3, true, "foo", "bar"}
+	v = Last(anySl)
+	e = "bar"
+	if v != e {
+		t.Errorf("%T %#v, expected %T %#v", v, v, e, e)
+	}
+}
+
+/*
+	this test only runs in Go 1.26+;
+	which lets you new() on values instead of just types.
+
+	commented out until req bumps to 1.26+ in go.mod.
+*/
+/*
+func TestLastPtr(t *testing.T) {
+
+	var v any
+	var i *int
+	var s *string
+	var b *bool
+	var ptrIntSl []*int
+	var ptrStrSl []*string
+	var ptrBoolSl []*bool
+
+
+	//
+	//	int
+	//
+	// nil
+	v = Last(ptrIntSl)
+	i = nil
+	if v != i {
+		t.Errorf("%T %#v, expected %T %#v", v, v, i, i)
+	}
+	// empty
+	ptrIntSl = make([]*int, 0)
+	v = Last(ptrIntSl)
+	if v != i { // still expect nil
+		t.Errorf("%T %#v, expected %T %#v", v, v, i, i)
+	}
+	// populated
+	ptrIntSl = []*int{new(0), new(1), new(2), new(3)}
+	v = Last(ptrIntSl)
+	i = ptrIntSl[len(ptrIntSl)-1]
+	if v != i {
+		t.Errorf("%T %#v, expected %T %#v", v, v, i, i)
+	}
+
+	//
+	//	string
+	//
+	// nil
+	v = Last(ptrStrSl)
+	if v != s {
+		t.Errorf("%T %#v, expected %T %#v", v, v, s, s)
+	}
+	// empty
+	ptrStrSl = make([]*string, 0)
+	v = Last(ptrStrSl)
+	if v != s { // still expect nil
+		t.Errorf("%T %#v, expected %T %#v", v, v, s, s)
+	}
+	// populated
+	ptrStrSl = []*string{new("a"), new("b"), new("c")}
+	v = Last(ptrStrSl)
+	s = ptrStrSl[len(ptrStrSl)-1]
+	if v != s {
+		t.Errorf("%T %#v, expected %T %#v", v, v, s, s)
+	}
+
+	//
+	//	bool
+	//
+	// nil
+	v = Last(ptrBoolSl)
+	if v != b {
+		t.Errorf("%T %#v, expected %T %#v", v, v, b, b)
+	}
+	// empty
+	ptrBoolSl = make([]*bool, 0)
+	v = Last(ptrBoolSl)
+	if v != b { // still expect nil
+		t.Errorf("%T %#v, expected %T %#v", v, v, b, b)
+	}
+	// populated
+	ptrBoolSl = []*bool{new(true), new(false), new(true), new(false), new(true)}
+	v = Last(ptrBoolSl)
+	b = ptrBoolSl[len(ptrBoolSl)-1]
+	if v != b {
+		t.Errorf("%T %#v, expected %T %#v", v, v, b, b)
+	}
+}
+*/
+
+func TestLastIndex(t *testing.T) {
+
+	var e int
+	var v int
+	var s []string
+
+	e = -2
+	v = LastIndex(s)
+	if e != v {
+		t.Errorf("Got %d, expected %d", v, e)
+	}
+
+	e = -1
+	s = make([]string, 0)
+	v = LastIndex(s)
+	if e != v {
+		t.Errorf("Got %d, expected %d", v, e)
+	}
+
+	e = 0
+	s = []string{"a"}
+	v = LastIndex(s)
+	if e != v {
+		t.Errorf("Got %d, expected %d", v, e)
+	}
+
+	e = 1
+	s = []string{"a", "b"}
+	v = LastIndex(s)
+	if e != v {
+		t.Errorf("Got %d, expected %d", v, e)
+	}
+
+	e = 2
+	s = []string{"a", "b", "c"}
+	v = LastIndex(s)
+	if e != v {
+		t.Errorf("Got %d, expected %d", v, e)
+	}
+}