Add custom constructor for the collection and extend existing collection methods

Author: kpeu3i

README.md

@@ -91,15 +91,16 @@ When *Fielder* is applied to a type, it will generate public functions/methods a
     * Method `<Type><Suffix>List::Contains` returns true if the collection contains the value.
     * Method `<Type><Suffix>List::Equals` returns true if the two collections are equal.
     * Method `<Type><Suffix>List::Similar` returns true if the two collections contain the same values.
-    * Method `<Type><Suffix>List::Add` adds the value to the collection.
-    * Method `<Type><Suffix>List::AddIfNotContains` adds the value to the collection if it is not already in the collection.
-    * Method `<Type><Suffix>List::Remove` removes the value from the collection.
+    * Method `<Type><Suffix>List::Add` adds the values to the collection.
+    * Method `<Type><Suffix>List::AddIfNotContains` adds the values to the collection if they are not already present.
+    * Method `<Type><Suffix>List::Remove` removes the values from the collection.
     * Method `<Type><Suffix>List::Clear` clears the collection.
     * Method `<Type><Suffix>List::Strings` returns a slice with all the strings of the collection items.
 * Functions:
     * `<Type><Suffix>Values` returns a slice with all the values of the ENUM.
     * `<Type><Suffix>Strings` returns a slice with all the strings of the ENUM.
     * `New<Type><Suffix>` returns a new collection with all the values of the ENUM.
+    * `New<Type><Suffix>With` returns a new collection with the given values of the ENUM.
 
 ## Inspiring projects
   * [enumer](https://github.com/dmarkham/enumer)

examples/simple/models/user_account_fielder.go

@@ -88,14 +88,14 @@ func (l {{ $fieldListType}}) Similar(other {{ $fieldListType}}) bool {
 	return true
 }
 
-// Add adds the value to the collection.
-func (l *{{ $fieldListType}}) Add(v {{ $fieldType}}) *{{ $fieldListType}} {
-	*l = append(*l, v)
+// Add adds the values to the collection.
+func (l *{{ $fieldListType}}) Add(v ...{{ $fieldType}}) *{{ $fieldListType}} {
+    *l = append(*l, v...)
 
 	return l
 }
 
-// AddIfNotContains adds the value to the collection if it is not already in the collection.
+// AddIfNotContains adds the values to the collection if they are not already present.
 func (l *{{ $fieldListType}}) AddIfNotContains(v ...{{ $fieldType}}) *{{ $fieldListType}} {
 	for _, x := range v {
 		if !l.Contains(x) {
@@ -106,13 +106,15 @@ func (l *{{ $fieldListType}}) AddIfNotContains(v ...{{ $fieldType}}) *{{ $fieldL
 	return l
 }
 
-// Remove removes the value from the collection.
-func (l *{{ $fieldListType}}) Remove(v {{ $fieldType}}) *{{ $fieldListType}} {
-	for i, x := range *l {
-		if x == v {
-			*l = append((*l)[:i], (*l)[i+1:]...)
+// Remove removes the values from the collection.
+func (l *{{ $fieldListType}}) Remove(v ...{{ $fieldType}}) *{{ $fieldListType}} {
+	for _, x := range v {
+		for i, y := range *l {
+			if y == x {
+				*l = append((*l)[:i], (*l)[i+1:]...)
 
-			return l
+				break
+			}
 		}
 	}
 
@@ -163,3 +165,13 @@ func New{{ $fieldListType }}() {{ $fieldListType }} {
 
    return result
 }
+
+// New{{ $fieldListType }}With returns a new {{ $fieldListType }} with the given values of the ENUM.
+func New{{ $fieldListType }}With(v ...{{ $fieldType}}) {{ $fieldListType }} {
+	result := {{ $fieldListType }}{}
+	if len(v) > 0 {
+		result.Add(v...)
+	}
+
+	return result
+}