match operator

匹配运算符

PHP有一个名为match的控制结构，从PHP8.0开始引入。

这就像switch控制结构的简化。

例子：

 $ food = ' strawberry ' ;
$ description = match ( $ food ) {
  ' apple ' => ' This food is an apple ' ,
  ' strawberry ' , ' raspberry ' => ' This food is a red fruit ' ,
}; // This food is a red fruit

$ food = ' unknown ' ;
$ description = match ( $ food ) {
  ' apple ' => ' This food is an apple ' ,
  ' strawberry ' , ' raspberry ' => ' This food is a red fruit ' ,
}; // UnhandledMatchError

$ food = ' unknown ' ;
$ description = match ( $ food ) {
  ' apple ' => ' This food is an apple ' ,
  ' strawberry ' , ' raspberry ' => ' This food is a red fruit ' ,
  default => ' This food is unknown ' ,
}; // This food is unknown

用法

这个包试图将该控制结构移植到 JS 函数，这是最接近的可能方式。

例子：

 import match from 'match-operator'

const food = 'strawberry'
const description = match ( food , [
  [ 'apple' , 'This food is an apple' ] ,
  [ 'strawberry' , 'raspberry' , 'This food is a red fruit' ] ,
] ) // This food is a red fruit

const food = 'unknown'
const description = match ( food , [
  [ 'apple' , 'This food is an apple' ] ,
  [ 'strawberry' , 'raspberry' , 'This food is a red fruit' ] ,
] ) // UnhandledMatchError

const food = 'unknown'
const description = match ( food , [
  [ 'apple' , 'This food is an apple' ] ,
  [ 'strawberry' , 'raspberry' , 'This food is a red fruit' ] ,
  [ match . default , 'This food is unknown' ]
] ) // This food is unknown 

替代语法

如果您发现一系列主题更具可读性，则可以使用它。

 const description = match ( food , [
  [ [ 'strawberry' , 'raspberry' ] , 'This food is a red fruit' ] ,
] ) 

安装

 npm install match-operator --save # If you're using NPM
yarn add match-operator # If you're using Yarn

测试

 npm run test # If you're using NPM
yarn test # If you're using Yarn

免责声明

这是我的第一个 Typescript 包 - 请善待！

执照

麻省理工学院。