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List: varargs for Append,Prepend,NewList #33

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merged 1 commit into from
Dec 26, 2022
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List: varargs for Append,Prepend,NewList #33

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26 changes: 19 additions & 7 deletions immutable.go
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Original file line number Diff line number Diff line change
Expand Up @@ -62,10 +62,14 @@ type List[T any] struct {
}

// NewList returns a new empty instance of List.
func NewList[T any]() *List[T] {
return &List[T]{
func NewList[T any](values ...T) *List[T] {
l := &List[T]{
root: &listLeafNode[T]{},
}
for _, value := range values {
l.append(value, true)
}
return l
}

// clone returns a copy of the list.
Expand Down Expand Up @@ -113,8 +117,12 @@ func (l *List[T]) set(index int, value T, mutable bool) *List[T] {
}

// Append returns a new list with value added to the end of the list.
func (l *List[T]) Append(value T) *List[T] {
return l.append(value, false)
func (l *List[T]) Append(values ...T) *List[T] {
other := l.clone()
for _, value := range values {
other.append(value, true)
}
return other
}

func (l *List[T]) append(value T, mutable bool) *List[T] {
Expand All @@ -136,9 +144,13 @@ func (l *List[T]) append(value T, mutable bool) *List[T] {
return other
}

// Prepend returns a new list with value added to the beginning of the list.
func (l *List[T]) Prepend(value T) *List[T] {
return l.prepend(value, false)
// Prepend returns a new list with value(s) added to the beginning of the list.
func (l *List[T]) Prepend(values ...T) *List[T] {
other := l.clone()
for i := len(values) - 1; i >= 0; i-- {
other.prepend(values[i], true)
}
return other
}

func (l *List[T]) prepend(value T, mutable bool) *List[T] {
Expand Down