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添加 IfThenElse 函数返回泛型结果 #259

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32 changes: 32 additions & 0 deletions condition.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
// Copyright 2021 ecodeclub
//
// 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.

package ekit

// IfThenElse 根据条件返回对应的泛型结果
// 注意避免结果的空指针问题
func IfThenElse[T any](condition bool, trueValue, falseValue T) T {
if condition {
return trueValue
}
return falseValue
}

// IfThenElseFunc 根据条件执行对应的函数并返回泛型结果
func IfThenElseFunc[T any](condition bool, trueFunc, falseFunc func() (T, error)) (T, error) {
if condition {
return trueFunc()
}
return falseFunc()
}
65 changes: 65 additions & 0 deletions condition_test.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,65 @@
// Copyright 2021 ecodeclub
//
// 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.

package ekit

import (
"errors"
"fmt"
"testing"

"github.com/stretchr/testify/assert"
)

func TestIfThenElse(t *testing.T) {
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i := 7
i = IfThenElse(false, i, 0)
assert.Equal(t, i, 0)
}

func ExampleIfThenElse() {
result := IfThenElse(true, "yes", "no")
fmt.Println(result)

// Output:
// yes
}

func TestIfThenElseFunc(t *testing.T) {
resp, err := IfThenElseFunc(true, func() (int, error) {
return 0, nil
}, func() (int, error) {
return 1, errors.New("some error")
})
assert.NoError(t, err)
assert.Equal(t, resp, 0)
}

func ExampleIfThenElseFunc() {
code, err := IfThenElseFunc(false, func() (code int, err error) {
// do something when condition is true
// ...
return 0, nil
}, func() (code int, err error) {
// do something when condition is false
// ...
return 1, errors.New("some error when execute func2")
})
fmt.Println(code)
fmt.Println(err)

// Output:
// 1
// some error when execute func2
}
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