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56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
// Copyright (c) 2023 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package option
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import "fmt"
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func ExampleOption_creation() {
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// Build an Option
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none1 := None[int]()
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some1 := Some("value")
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// Build from a value
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fromNillable := FromNillable[string]
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nonFromNil := fromNillable(nil) // None[*string]
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value := "value"
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someFromPointer := fromNillable(&value) // Some[*string](xxx)
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// some predicate
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isEven := func(num int) bool {
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return num%2 == 0
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}
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fromEven := FromPredicate(isEven)
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noneFromPred := fromEven(3) // None[int]
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someFromPred := fromEven(4) // Some[int](4)
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fmt.Println(none1)
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fmt.Println(some1)
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fmt.Println(nonFromNil)
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fmt.Println(IsSome(someFromPointer))
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fmt.Println(noneFromPred)
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fmt.Println(someFromPred)
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// Output:
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// None[int]
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// Some[string](value)
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// None[*string]
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// true
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// None[int]
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// Some[int](4)
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}
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