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Merge pull request #17 from IBM/cleue-add-take
fix: add Take to Iterables
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// Copyright (c) 2023 IBM Corp. | ||
// All rights reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package generic | ||
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import ( | ||
F "github.com/IBM/fp-go/function" | ||
O "github.com/IBM/fp-go/option" | ||
T "github.com/IBM/fp-go/tuple" | ||
) | ||
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func Scan[GV ~func() O.Option[T.Tuple2[GV, V]], GU ~func() O.Option[T.Tuple2[GU, U]], FCT ~func(V, U) V, U, V any](f FCT, initial V) func(ma GU) GV { | ||
// pre-declare to avoid cyclic reference | ||
var recurse func(ma GU, v V) GV | ||
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recurse = func(ma GU, current V) GV { | ||
return F.Nullary2( | ||
ma, | ||
O.Map(func(t T.Tuple2[GU, U]) T.Tuple2[GV, V] { | ||
v := f(current, t.F2) | ||
return T.MakeTuple2(recurse(t.F1, v), v) | ||
}), | ||
) | ||
} | ||
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return F.Bind2nd(recurse, initial) | ||
} |
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// Copyright (c) 2023 IBM Corp. | ||
// All rights reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package generic | ||
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import ( | ||
F "github.com/IBM/fp-go/function" | ||
N "github.com/IBM/fp-go/number/integer" | ||
O "github.com/IBM/fp-go/option" | ||
T "github.com/IBM/fp-go/tuple" | ||
) | ||
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func Take[GU ~func() O.Option[T.Tuple2[GU, U]], U any](n int) func(ma GU) GU { | ||
// pre-declare to avoid cyclic reference | ||
var recurse func(ma GU, idx int) GU | ||
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fromPred := O.FromPredicate(N.Between(0, n)) | ||
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recurse = func(ma GU, idx int) GU { | ||
return func() O.Option[T.Tuple2[GU, U]] { | ||
return F.Pipe2( | ||
idx, | ||
fromPred, | ||
O.Chain(F.Ignore1of1[int](F.Nullary2( | ||
ma, | ||
O.Map(func(t T.Tuple2[GU, U]) T.Tuple2[GU, U] { | ||
return T.MakeTuple2(recurse(t.F1, idx+1), t.F2) | ||
}), | ||
))), | ||
) | ||
} | ||
} | ||
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return F.Bind2nd(recurse, 0) | ||
} |
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// Copyright (c) 2023 IBM Corp. | ||
// All rights reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package stateless | ||
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import ( | ||
G "github.com/IBM/fp-go/iterator/stateless/generic" | ||
) | ||
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// Scan takes an [Iterator] and returns a new [Iterator] of the same length, where the values | ||
// of the new [Iterator] are the result of the application of `f` to the value of the | ||
// source iterator with the previously accumulated value | ||
func Scan[FCT ~func(V, U) V, U, V any](f FCT, initial V) func(ma Iterator[U]) Iterator[V] { | ||
return G.Scan[Iterator[V], Iterator[U], FCT](f, initial) | ||
} |
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// Copyright (c) 2023 IBM Corp. | ||
// All rights reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package stateless | ||
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import ( | ||
"testing" | ||
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F "github.com/IBM/fp-go/function" | ||
T "github.com/IBM/fp-go/tuple" | ||
"github.com/stretchr/testify/assert" | ||
) | ||
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func TestScan(t *testing.T) { | ||
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src := From("a", "b", "c") | ||
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dst := F.Pipe1( | ||
src, | ||
Scan(func(cur T.Tuple2[int, string], val string) T.Tuple2[int, string] { | ||
return T.MakeTuple2(cur.F1+1, val) | ||
}, T.MakeTuple2(0, "")), | ||
) | ||
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assert.Equal(t, ToArray(From( | ||
T.MakeTuple2(1, "a"), | ||
T.MakeTuple2(2, "b"), | ||
T.MakeTuple2(3, "c"), | ||
)), ToArray(dst)) | ||
} |
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// Copyright (c) 2023 IBM Corp. | ||
// All rights reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package stateless | ||
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import ( | ||
G "github.com/IBM/fp-go/iterator/stateless/generic" | ||
) | ||
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// Take limits the number of values in the [Iterator] to a maximum number | ||
func Take[U any](n int) func(ma Iterator[U]) Iterator[U] { | ||
return G.Take[Iterator[U]](n) | ||
} |
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@@ -0,0 +1,36 @@ | ||
// Copyright (c) 2023 IBM Corp. | ||
// All rights reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package stateless | ||
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import ( | ||
"testing" | ||
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F "github.com/IBM/fp-go/function" | ||
"github.com/stretchr/testify/assert" | ||
) | ||
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func TestTake(t *testing.T) { | ||
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total := MakeBy(100, F.Identity[int]) | ||
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trimmed := F.Pipe1( | ||
total, | ||
Take[int](10), | ||
) | ||
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assert.Equal(t, ToArray(MakeBy(10, F.Identity[int])), ToArray(trimmed)) | ||
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} |