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slices/maps: Return nil if source is nil #88

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Merged
tgallice merged 1 commit into from
Jun 23, 2026
Merged

slices/maps: Return nil if source is nil #88

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4 changes: 4 additions & 0 deletions slices/map.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,10 @@ import "context"
// MapWithContextError transforms a slice of a given type to a new slice of a
// different type using a context and can return an error.
func MapWithContextError[T, K any](ctx context.Context, ss []T, fn func(context.Context, T) (K, error)) ([]K, error) {
if ss == nil {
return nil, nil
}

var res = make([]K, len(ss))

for i, v := range ss {
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6 changes: 6 additions & 0 deletions slices/map_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,12 @@ func TestMapWithContextError(t *testing.T) {
},
want: []int64{1, 22},
},
{
name: "nil",
fn: func(context.Context, string) (int64, error) {
return 0, nil
},
},
} {
t.Run(tt.name, func(t *testing.T) {
got, err := MapWithContextError(ctx, tt.in, tt.fn)
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