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TXJGUʹ͓͚Δ
ԆධՁ
$POOFIJUP.BSDIÉˌʙJ04ࢢʙ
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ॴଐɿίωώτגࣜձࣾ
ۀɿJ04ΞϓϦ։ൃ
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ͦͦ
ԆධՁͱ
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݁Ռ͕ඞཁʹͳΔ·ͰؔΛ࣮ߦ͠ͳ͍͜ͱ
CZ͍͢͝)ຊ
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No content
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class LazyCat {
var name = ""
lazy var selfIntro: String = {
return "໊લ\(name)Ͱ͢"
}()
}
let cat = LazyCat()
cat.name = "γϩίϚ"
print(cat.selfIntro) // selfIntro͕ॳظԽ͞ΕΔ
// ໊લγϩίϚͰ͢
cat.name = "ΫϩίϚ"
print(cat.selfIntro) // ΫϩίϚө͞Εͳ͍ʂ
// ໊લγϩίϚͰ͢
ॳΊͯࢀরͨ͠ ඞཁʹͳͬͨ
࣌ʹॳظԽ͞ΕΔʂ
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TXJGUʹओʹ
छྨͷ͍ํ͕͋Δ
MB[ZQSPQFSUZ
MB[ZDPMMFDUJPO
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MB[ZQSPQFSUZ
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MB[ZQSPQFSUZ
ɾMB[Zम০ࢠΛ͚ͭΔ͜ͱͰએݴͰ͖Δ
ɾॳճΞΫηε࣌ʹ͕ॳظԽ͞ΕΔ
ɾMB[Zम০ࢠWBSʹ͔͚ͭ͠ΒΕͳ͍
class LazyCat {
lazy var name = "γϩίϚ"
}
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ͳͥWBS͚ͩʁ
ఆ MFU
ΠϯελϯεͷॳظԽྃ࣌ʹΛ
อ͍࣋ͯ͠ͳ͚ΕͳΒͳ͍
MB[ZΛ͚ͭΔͱॳظԽ࣌Ͱͳ͘ΞΫηε࣌ʹ
͕อ࣋͞ΕΔΑ͏ʹͳΔ
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Կ͕خ͍͠ͷ͔
ɾॳظԽ࣌ʹTFMG͕͑Δ
ɾෆཁͳBMMPDBUJPO͕ൃੜ͠ͳ͍
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class LazyCat {
var name = "γϩίϚ"
lazy var selfIntro: String = {
return "໊લ\(self.name)Ͱ͢"
}()
var selfIntroduction: String = {
return "໊લ\(self.name)Ͱ͢"
}()
// error: Use of unresolved identifier 'self'
}
DMPTVSFͰΠϯελϯεมʹΞΫηεͰ͖Δʂ
ॳظԽ࣌ʹTFMG͕͑Δ
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class LazyCat {
lazy var lazyName = name()
var normalName = name()
// Cannot use instance member 'name' within property initializer
// property initializers run before 'self' is available
func name() -> String {
return "γϩίϚ"
}
}
ΠϯελϯεϝιουͰॳظԽͰ͖Δ
ॳظԽ࣌ʹTFMG͕͑Δ
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class LazyCat {
lazy var ja = "ʹΌʙ"
lazy var en = "mew"
}
let cat = LazyCat() // ͲͪΒallocate͞Ε͍ͯͳ͍
print(cat.ja) // englishallocate͞Εͳ͍
ඞཁͳ࣌ʹBMMPDBUJPO͕ൃੜ͢ΔͨΊ
ϝϞϦΛઅͰ͖Δ
ෆཁͳBMMPDBUJPO͕ൃੜ͠ͳ͍
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MB[ZDPMMFDUJPO
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NBQ
pMUFSͳͲ͕
ԆධՁ͞ΕΔDPMMFDUJPO
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let array = Array(1...10)
let lazyArray = array.lazy
MB[ZͰऔಘͰ͖Δʂ
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NBQ
pMUFSͷධՁ
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௨ৗͷDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let normalArray = array.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
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௨ৗͷDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let normalArray = array.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
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௨ৗͷDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let normalArray = array.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
print(normalArray.first)
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Optional(2)
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௨ৗͷDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let normalArray = array.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
print(normalArray.first)
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Optional(2)
<
>
ˣ
<
>
ˣ
<
>
ˣ
NBQ\^
pMUFS\^
pSTU
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௨ৗͷDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let normalArray = array.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
print(normalArray.first)
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Optional(2)
<
>
ˣ
<
>
ˣ
<
>
ˣ
NBQ\^
pMUFS\^
pSTU
ແବ͕ଟ͍
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MB[ZDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let lazyArray = array.lazy
.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
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MB[ZDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let lazyArray = array.lazy
.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
ϩά͕දࣔ͞Εͳ͍
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MB[ZDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let lazyArray = array.lazy
.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
print(lazyArray.first)
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Optional(2)
pSTUʹΞΫηεͨ࣌͠ʢඞཁʹͳͬͨ࣌ʣʹ
ඞཁͳ͚ͩNBQ
pMUFS͕ධՁ͞ΕΔʂ
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MB[ZDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let lazyArray = array.lazy
.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
print(lazyArray.first)
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Optional(2)
pSTUʹΞΫηεͨ࣌͠ʢඞཁʹͳͬͨ࣌ʣ
ඞཁͳ͚ͩNBQ
pMUFS͕ධՁ͞ΕΔʂ
<
>
ˣ
<>
ˣ
<>
ˣ
NBQ\^
pMUFS\^
pSTU
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MB[ZDPMMFDUJPOͷڍಈ
let array = Array(1...10)
let lazyArray = array.lazy
.map { value -> Int in
print(value)
return value * 2
}
.filter { value in
print(value)
return value < 10
}
print(lazyArray.first)
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2
Optional(2)
pSTUʹΞΫηεͨ࣌͠ʢඞཁʹͳͬͨ࣌ʣ
ඞཁͳ͚ͩNBQ
pMUFS͕ධՁ͞ΕΔʂ
<
>
ˣ
<>
ˣ
<>
ˣ
NBQ\^
pMUFS\^
pSTU
ແବ͕ͳ͍ʂ
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·ͱΊ
TXJGUͷԆධՁ
ɾMB[ZQSPQFSUZ
ɾMB[ZDPMMFDUJPO
MB[ZQSPQFSUZ
ɾॳظԽ࣌ʹTFMGΛ͑Δ
ɾϝϞϦΛઅͰ͖Δ
MB[ZDPMMFDUJPO
ɾNBQ
pMUFSར༻࣌ʹඞཁͳ͚ͩධՁ͞ΕΔ