Yuka Ezura ezura
ezura
/ null.kt
Created
June 19, 2017 05:50
kotlin nullable のとこ https://news.realm.io/jp/news/droidkaigi17-kotlin-bytecode/
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| // TODO |
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| /* | |
| if, when(switch) が式 | |
| */ |
ezura
/ CodePiece.kt
Created
June 18, 2017 12:39
Nothing は全ての型サブタイプ && `interface List<out E>` だからこの `emptyList` の実装できるのかな (｡ ・ω・)) #CodePiece #kotlin
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| fun <T> listOf(vararg elements: T): List<T> = if (elements.size > 0) elements.asList() else emptyList() | |
| fun <T> emptyList(): List<T> = EmptyList | |
| object EmptyList : List<Nothing> |
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| interface List<out E> : Collection<E> | |
| interface MutableList<E> : List<E>, MutableCollection<E> |
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| fun <T> listOf(vararg elements: T): List<T> = if (elements.size > 0) elements.asList() else emptyList() | |
| fun <T> emptyList(): List<T> = EmptyList | |
| object EmptyList : List<Nothing> |
ezura
/ kotlin_032
Last active
June 18, 2017 09:12
整数リテラルは Int になる。*literalConvertible 的なものはない？暗黙的型変換がないとのこと。型変換するときはメソッドを使う。Swift と違い、変換元の方が変換の責任を持っているように見える。
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| val i: Double = 1 // 型 error | |
| val i_: Double = 1.toDouble() |
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| let gV = 1 | |
| func f1() -> Never { | |
| var v = 1 | |
| while true { | |
| if false { break } | |
| if true { /* v = 2 */ } else { break } | |
| if 1 < 0 { break } | |
| if v < 0 { break } | |
| // if gV < 0 { break } // ❌ | |
| if true { v = 0 } else { break } // ❌ |
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| let gV = 1 | |
| func f1() -> Never { | |
| var v = 1 | |
| while true { | |
| if false { break } | |
| if true { v = 2 } else { break } | |
| if 1 < 0 { break } | |
| if v < 0 { break } | |
| // if gV < 0 { break } // ❌ | |
| if true { v = 0 } else { break } |
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| func f1() -> Never { | |
| while true { } | |
| } | |
| func f2() -> Int { | |
| while true { } | |
| } |
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| func f() -> Never { | |
| while true { } | |
| } |