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fix: add example for dependency injection using a Reader
Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
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75
samples/getting-started-with-fp-ts/reader/example1/reader_test.go
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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 reader implements the example in [https://dev.to/gcanti/getting-started-with-fp-ts-reader-1ie5] | ||
package example1 | ||
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import ( | ||
"fmt" | ||
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F "github.com/IBM/fp-go/function" | ||
N "github.com/IBM/fp-go/number" | ||
I "github.com/IBM/fp-go/number/integer" | ||
"github.com/IBM/fp-go/ord" | ||
R "github.com/IBM/fp-go/reader" | ||
S "github.com/IBM/fp-go/string" | ||
) | ||
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type ( | ||
I18n struct { | ||
True string | ||
False string | ||
} | ||
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Dependencies struct { | ||
I18n I18n | ||
} | ||
) | ||
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var ( | ||
// g: func(int) R.Reader[*Dependencies, string], note how the implementation does not depend on the dependencies | ||
g = F.Flow2( | ||
ord.Gt(I.Ord)(2), | ||
f, | ||
) | ||
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// h: func(string) R.Reader[*Dependencies, string], note how the implementation does not depend on the dependencies | ||
h = F.Flow3( | ||
S.Size, | ||
N.Add(1), | ||
g, | ||
) | ||
) | ||
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func f(b bool) R.Reader[*Dependencies, string] { | ||
return func(deps *Dependencies) string { | ||
if b { | ||
return deps.I18n.True | ||
} | ||
return deps.I18n.False | ||
} | ||
} | ||
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func ExampleReader() { | ||
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deps := Dependencies{I18n: I18n{True: "vero", False: "falso"}} | ||
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fmt.Println(h("foo")(&deps)) | ||
fmt.Println(h("a")(&deps)) | ||
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// Output: | ||
// vero | ||
// falso | ||
} |
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samples/getting-started-with-fp-ts/reader/example2/reader_test.go
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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 reader implements the example in [https://dev.to/gcanti/getting-started-with-fp-ts-reader-1ie5] | ||
package example2 | ||
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import ( | ||
"fmt" | ||
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F "github.com/IBM/fp-go/function" | ||
ID "github.com/IBM/fp-go/identity" | ||
N "github.com/IBM/fp-go/number" | ||
I "github.com/IBM/fp-go/number/integer" | ||
"github.com/IBM/fp-go/ord" | ||
R "github.com/IBM/fp-go/reader" | ||
S "github.com/IBM/fp-go/string" | ||
) | ||
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type ( | ||
I18n struct { | ||
True string | ||
False string | ||
} | ||
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Dependencies struct { | ||
I18n I18n | ||
LowerBound int | ||
} | ||
) | ||
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var ( | ||
// h: func(string) R.Reader[*Dependencies, string], note how the implementation does not depend on the dependencies | ||
h = F.Flow3( | ||
S.Size, | ||
N.Add(1), | ||
g, | ||
) | ||
) | ||
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func getLowerBound(deps *Dependencies) int { | ||
return deps.LowerBound | ||
} | ||
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func g(n int) R.Reader[*Dependencies, string] { | ||
return F.Pipe1( | ||
R.Ask[*Dependencies](), | ||
R.Chain(F.Flow4( | ||
getLowerBound, | ||
ord.Gt(I.Ord), | ||
ID.Flap[bool](n), | ||
f, | ||
)), | ||
) | ||
} | ||
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func f(b bool) R.Reader[*Dependencies, string] { | ||
return func(deps *Dependencies) string { | ||
if b { | ||
return deps.I18n.True | ||
} | ||
return deps.I18n.False | ||
} | ||
} | ||
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func ExampleReader() { | ||
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deps1 := Dependencies{I18n: I18n{True: "vero", False: "falso"}, LowerBound: 2} | ||
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hFoo := h("foo") | ||
hA := h("a") | ||
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fmt.Println(hFoo(&deps1)) | ||
fmt.Println(hA(&deps1)) | ||
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deps2 := Dependencies{I18n: I18n{True: "vero", False: "falso"}, LowerBound: 4} | ||
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fmt.Println(hFoo(&deps2)) | ||
fmt.Println(hA(&deps2)) | ||
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// Output: | ||
// vero | ||
// falso | ||
// falso | ||
// falso | ||
} |