Merge pull request #88 from emirpasic/development

List bulk initialization

lists/arraylist/arraylist.go

@@ -32,9 +32,13 @@ const (
 	shrinkFactor = float32(0.25) // shrink when size is 25% of capacity (0 means never shrink)
 )
 
-// New instantiates a new empty list
+// New instantiates a new list and adds the passed values, if any, to the list
-func New() *List {
+func New(values ...interface{}) *List {
-	return &List{}
+	list := &List{}
+	if len(values) > 0 {
+		list.Add(values...)
+	}
+	return list
 }
 
 // Add appends a value at the end of the list

lists/arraylist/arraylist_test.go

@@ -6,11 +6,36 @@ package arraylist
 
 import (
 	"fmt"
-	"testing"
-
 	"github.com/emirpasic/gods/utils"
+	"testing"
 )
 
+func TestListNew(t *testing.T) {
+	list1 := New()
+
+	if actualValue := list1.Empty(); actualValue != true {
+		t.Errorf("Got %v expected %v", actualValue, true)
+	}
+
+	list2 := New(1, "b")
+
+	if actualValue := list2.Size(); actualValue != 2 {
+		t.Errorf("Got %v expected %v", actualValue, 2)
+	}
+
+	if actualValue, ok := list2.Get(0); actualValue != 1 || !ok {
+		t.Errorf("Got %v expected %v", actualValue, 1)
+	}
+
+	if actualValue, ok := list2.Get(1); actualValue != "b" || !ok {
+		t.Errorf("Got %v expected %v", actualValue, "b")
+	}
+
+	if actualValue, ok := list2.Get(2); actualValue != nil || ok {
+		t.Errorf("Got %v expected %v", actualValue, nil)
+	}
+}
+
 func TestListAdd(t *testing.T) {
 	list := New()
 	list.Add("a")

lists/doublylinkedlist/doublylinkedlist.go

@@ -34,9 +34,13 @@ type element struct {
 	next  *element
 }
 
-// New instantiates a new empty list
+// New instantiates a new list and adds the passed values, if any, to the list
-func New() *List {
+func New(values ...interface{}) *List {
-	return &List{}
+	list := &List{}
+	if len(values) > 0 {
+		list.Add(values...)
+	}
+	return list
 }
 
 // Add appends a value (one or more) at the end of the list (same as Append())

lists/doublylinkedlist/doublylinkedlist_test.go

@@ -11,6 +11,32 @@ import (
 	"github.com/emirpasic/gods/utils"
 )
 
+func TestListNew(t *testing.T) {
+	list1 := New()
+
+	if actualValue := list1.Empty(); actualValue != true {
+		t.Errorf("Got %v expected %v", actualValue, true)
+	}
+
+	list2 := New(1, "b")
+
+	if actualValue := list2.Size(); actualValue != 2 {
+		t.Errorf("Got %v expected %v", actualValue, 2)
+	}
+
+	if actualValue, ok := list2.Get(0); actualValue != 1 || !ok {
+		t.Errorf("Got %v expected %v", actualValue, 1)
+	}
+
+	if actualValue, ok := list2.Get(1); actualValue != "b" || !ok {
+		t.Errorf("Got %v expected %v", actualValue, "b")
+	}
+
+	if actualValue, ok := list2.Get(2); actualValue != nil || ok {
+		t.Errorf("Got %v expected %v", actualValue, nil)
+	}
+}
+
 func TestListAdd(t *testing.T) {
 	list := New()
 	list.Add("a")

lists/singlylinkedlist/singlylinkedlist.go

@@ -33,9 +33,13 @@ type element struct {
 	next  *element
 }
 
-// New instantiates a new empty list
+// New instantiates a new list and adds the passed values, if any, to the list
-func New() *List {
+func New(values ...interface{}) *List {
-	return &List{}
+	list := &List{}
+	if len(values) > 0 {
+		list.Add(values...)
+	}
+	return list
 }
 
 // Add appends a value (one or more) at the end of the list (same as Append())

lists/singlylinkedlist/singlylinkedlist_test.go

@@ -11,6 +11,32 @@ import (
 	"github.com/emirpasic/gods/utils"
 )
 
+func TestListNew(t *testing.T) {
+	list1 := New()
+
+	if actualValue := list1.Empty(); actualValue != true {
+		t.Errorf("Got %v expected %v", actualValue, true)
+	}
+
+	list2 := New(1, "b")
+
+	if actualValue := list2.Size(); actualValue != 2 {
+		t.Errorf("Got %v expected %v", actualValue, 2)
+	}
+
+	if actualValue, ok := list2.Get(0); actualValue != 1 || !ok {
+		t.Errorf("Got %v expected %v", actualValue, 1)
+	}
+
+	if actualValue, ok := list2.Get(1); actualValue != "b" || !ok {
+		t.Errorf("Got %v expected %v", actualValue, "b")
+	}
+
+	if actualValue, ok := list2.Get(2); actualValue != nil || ok {
+		t.Errorf("Got %v expected %v", actualValue, nil)
+	}
+}
+
 func TestListAdd(t *testing.T) {
 	list := New()
 	list.Add("a")