如何收集记录的自定义类型的值并将其映射到字符串
如何收集记录的自定义类型的值并将其映射到字符串
提问于 2022-11-14 16:26:11
如何更多地简化display的代码：
这是我的初学者代码：
type Symbol = Cherry | Seven | Bar | Grapes
type alias Model =
{ one : Symbol
, two : Symbol
, three : Symbol
}
-- VIEW
display1 : Model -> String
display1 model =
case model.one of
Cherry ->
"Cherry"
Seven ->
"Seven"
Bar ->
"Bar"
Grapes ->
"Grapes"
display2 : Model -> String
display2 model =
case model.two of
Cherry ->
"Cherry"
Seven ->
"Seven"
Bar ->
"Bar"
Grapes ->
"Grapes"
display3 : Model -> String
display3 model =
case model.three of
Cherry ->
"Cherry"
Seven ->
"Seven"
Bar ->
"Bar"
Grapes ->
"Grapes"
display : Model -> String
display model =
display1(model) ++ " " ++ display2(model) ++ " " ++ display3(model)回答 1
Stack Overflow用户
回答已采纳
发布于 2022-11-14 16:46:38
您可以传递Symbol类型而不是Model，并拥有1函数而不是3：
type Symbol = Cherry | Seven | Bar | Grapes
type alias Model =
{ one : Symbol
, two : Symbol
, three : Symbol
}
-- VIEW
display1 : Symbol -> String
display1 symbol =
case symbol of
Cherry ->
"Cherry"
Seven ->
"Seven"
Bar ->
"Bar"
Grapes ->
"Grapes"
display : Model -> String
display model =
display1(model.one) ++ " " ++ display1(model.two) ++ " " ++ display1(model.three)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/74434819
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