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筋肉kt.pdf
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shogo.yamada
November 29, 2018
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筋肉kt.pdf
shogo.yamada
November 29, 2018
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Transcript
Copyright © ZOZO Technologies, Inc. All Right Reserved. גࣜձࣾ;0;0ςΫϊϩδʔζ ։ൃ෦
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Copyright © ZOZO Technologies, Inc. All Right Reserved. ,PUMJO1B[[MFSTͱʁ Kotlin
ConfͰൃද͞ΕͨʮKotlinΫΠζʯΈ͍ͨͳͷ https://www.youtube.com/watch?v=Xq9vBZs0j-8
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https://github.com/angryziber/kotlin-puzzlers
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d) Will not compile a -> A ɺ b -> Bɺ c -> bar ͱͨ͠ͱ͖ʹɺ foo(bar<A, B> b)
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d) Will not compile a -> A ɺ b -> Bɺ c -> bar ͱͨ͠ͱ͖ʹɺ foo(bar<A, B> b) ͻͱͭͷFunction(ؔ)ͱͯ͠ධՁ͞ΕΔ
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foo((c < a), b > d)
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logo͕ධՁ͞ΕΔ͔Βɻ KotlinΫϥεΛ Object Kotlin ʹ͢Δͱಈ͘ ਖ਼ղ b) NullPointerException
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ݺͼग़͞Εͨॠؒग़ྗ͞ΕΔ ɾVoid ϝιου Unit Λฦ͢ ɾUnit γϯάϧτϯͰɺ͍͠ͱఆ͞ΕΔ ɾҰ൪֎ͷ print ͕࣮ߦ͞ΕΔલʹ return false͞ΕΔ ਖ਼ղ a) HelloWorld
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val sum = x?:0 + y ਖ਼ղ c)2
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val sum = x?:0 + y ܭࢉॲཧͨ݁͠ՌΛnull͔Ͳ͏͔ఆ͢Δ(ΤϧϏεԋࢉࢠ) val sum = x?: 3
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Copyright © ZOZO Technologies, Inc. All Right Reserved. ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʙʂ ͥͻ࠙ձͰ͓͠·͠ΐ͏ʂʂ