match operator

匹配運算符

PHP有一個名為match的控制結構，從PHP8.0開始引進。

這就像是switch控制結構的簡化。

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

這個套件試圖將該控制結構移植到 JS 函數，這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 

替代語法

如果您發現一系列主題更具可讀性，則可以使用它。

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

安裝

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

測試

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

免責聲明

這是我的第一個 Typescript 包 - 請善待！

執照

麻省理工學院。