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Golang的三元表达式实现\n\n[中文文档](./README.md) | [English Document](./README_en.md)\n\n# 一、开发初衷\n\nGolang中缺少三元表达式，就导致某些情况三元表达式一行就能搞定的事情到Golang里面就得写得很啰嗦，\n这是无法忍受的，~~这个库就是借助大量自定义的if函数来实现类似三元表达式的功能~~，最新版本是基于泛型实现的。\n\n使用此库之前：\n\n```go\nif a % 2 == 0 {\n    return \"偶数\"\n} else {\n    return \"奇数\"\n}\n```\n\n使用此库之后：\n\n```go\nreturn if_expression.Return(a % 2 == 0, \"偶数\", \"奇数\")\n```\n\n对比：\n\n```diff\n- if a % 2 == 0 {\n- \treturn \"偶数\"\n- } else {\n- \treturn \"奇数\"\n- }\n+ return if_expression.Return(a % 2 == 0, \"偶数\", \"奇数\")\n```\n\n## 二、引入依赖\n\ngo get安装：\n\n```text\ngo get -u github.com/golang-infrastructure/go-if-expression\n```\n\n如果你不想增加新的依赖，直接拷贝下面这段代码到你的utils中，泛型的实现版本非常简洁：\n\n```go\npackage if_expression\n\n// Return\n//\n//\t@Description: if实现的三元表达式\n//\t@param boolExpression: 布尔表达式，最终返回一个布尔值\n//\t@param trueReturnValue: 当boolExpression返回值为true的时候返回的值\n//\t@param falseReturnValue: 当boolExpression返回值为false的时候返回的值\n//\t@return bool: 三元表达式的结果，为trueReturnValue或者falseReturnValue中的一个\nfunc Return[T any](boolExpression bool, trueReturnValue, falseReturnValue T) T {\n\tif boolExpression {\n\t\treturn trueReturnValue\n\t} else {\n\t\treturn falseReturnValue\n\t}\n}\n\n// ReturnByFunc\n//\n//\t@Description: if实现的三元表达式\n//\t@param boolExpression: 布尔表达式，最终返回一个布尔值\n//\t@param trueReturnValue: 当boolExpression返回值为true的时候执行此函数并返回值\n//\t@param falseReturnValue: 当boolExpression返回值为false的时候执行此函数并返回值\n//\t@return bool: 三元表达式的结果，为trueReturnValue或者falseReturnValue中的一个\nfunc ReturnByFunc[T any](boolExpression bool, trueFuncForReturnValue, falseFuncForReturnValue func() T) T {\n\tif boolExpression {\n\t\treturn trueFuncForReturnValue()\n\t} else {\n\t\treturn falseFuncForReturnValue()\n\t}\n}\n```\n\n# 三、 Example\n\n比如最常见的默认值场景：\n\n```go\nthreadNum := 0\nfmt.Printf(\"线程数： %d\", if_expression.Return(threadNum == 0, 1, threadNum))\n```\n\n使用的例子：\n\n```go\npackage main\n\nimport (\n\t\"fmt\"\n\tif_expression \"github.com/golang-infrastructure/go-if-expression\"\n)\n\nfunc main() {\n\n\tr := if_expression.Return(true, \"是\", \"否\")\n\tfmt.Println(r)\n\t// Output:\n\t// 是\n\n}\n\n```\n\n或者使用函数进行返回，仅有被命中分支的函数才会得到执行，不过这种方式并不简洁并不建议使用：\n\n```go\npackage main\n\nimport (\n\t\"fmt\"\n\tif_expression \"github.com/golang-infrastructure/go-if-expression\"\n)\n\nfunc main() {\n\n\tr := if_expression.ReturnByFunc(true, func() string {\n\t\tfmt.Println(\"True分支被执行了\")\n\t\treturn \"是\"\n\t}, func() string {\n\t\tfmt.Println(\"False分支被执行了\")\n\t\treturn \"否\"\n\t})\n\tfmt.Println(r)\n\t// Output:\n\t// True分支被执行了\n\t// 是\n\n}\n```\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgolang-infrastructure%2Fgo-if-expression","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fgolang-infrastructure%2Fgo-if-expression","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgolang-infrastructure%2Fgo-if-expression/lists"}