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itmammoth/file0.txt

Last active July 27, 2018 08:08
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kotlinでif文の条件に代入式を使いたい ref: https://qiita.com/itmammoth/items/e21dba17373e0aa7353e
Raw
file0.txt
if (val date = arguments?.getSerializable(ARG_DATE) as LocalDate) {
...
Raw
file1.txt
inline fun <T, R> ifNotNull(value: T?, thenPart: (T) -> R, elsePart: () -> R): R {
return if (value != null) {
thenPart(value)
} else {
elsePart()
}
}
Raw
file2.txt
val thenOrElse = ifNotNull(arguments?.getSerializable(ARG_DATE) as? LocalDate, {
// it => LocalDate
"then"
}, {
"else"
})
Raw
file3.txt
inline fun <T, R> ifNotNull(value: T?, thenPart: (T) -> R): R? {
return if (value != null) {
thenPart(value)
} else {
null
}
}
Raw
ifNotNull
inline fun <T, R> ifNotNull(value: T?, thenPart: (T) -> R, elsePart: () -> R): R {
return if (value != null) {
thenPart(value)
} else {
elsePart()
}
}
@itmammoth
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itmammoth commented Jul 20, 2018 •
edited
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You can write as below with this function.

val thenOrElse = ifNotNull(arguments?.getSerializable("date") as? LocalDate, {
    // it => LocalDate
    "then"
}, {
    "else"
})

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