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apply() 要らなくない?
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Motoi Washida
August 22, 2017
Programming
2
1.4k
apply() 要らなくない?
2017年の夏のKotlin LT祭での発表資料です。
https://kotlin.connpass.com/event/61427/
Motoi Washida
August 22, 2017
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Transcript
BQQMZ 銲זֻזְ 똲歊㛇
荈䊹稱➜
荈䊹稱➜ ˖ せ똲歊㛇 ˖ 5XJUUFS!XN ˖ "OESPJEؒٝآص، J04瘝װ ˖
3PPN$MJQהְֲ؎ٝذٔ،ⱖ溪ך $(.涪⚥
(PPHMF*0ך傈ח,PUMJO䱰欽׃ת׃
ַֿ ,PUMJO娖♲٠剢ך 蕯鰳罏ָזַ鎉ְתׅ
➙傈鎉ְְ✲
None
BQQMZ
銲זֻזְ
None
BQQMZ
أ؝٦فꟼ侧ך♧א ⴱ劍⻉ָٖؒؖٝز ח剅ֽ
BQQMZ ⢪זְה // { "key1": 1, "key2": 8 } //
ΛҾʹͯؔ͠Λݺͼ͍ͨ val map = Bundle() map.putInt("key1", 1) map.putInt("key2", 8) someFunction(map)
BQQMZ ⢪ֲה // { "key1": 1, "key2": 8 } //
ΛҾʹͯؔ͠Λݺͼ͍ͨ someMethod(Bundle().apply { putInt("key1", 1) putInt("key2", 8) })
瀉ְ
ֶ׃ׯ
,PUMJOזדכ ˟ הְֲ״+BWB 4XJGU鴟חכזְ
ד✉欽ׅה 汤ְ湡鋅ֲ
None
ㄎן⳿׃㼎韋ָ ♶僇然ח
⢽
⢽ class Point { var x = 0; var y
= 0 } var y = 0 // มએݴ val p = Point().apply { x = 3 y = 4 // Ͳͬͪͷ y? } println("p = (${p.x}, ${p.y})") // p = (3, 4) Λग़ྗͦ͠͏
⢽ class Point { var x = 0; var y
= 0 } var y = 0 // มએݴ val p = Point().apply { x = 3 y = 4 // Ͳͬͪͷ y? } println("p = (${p.x}, ${p.y})") // p = (3, 0) Λग़ྗ (※)
➿剏周
BMTP
➿剏周 class Point { var x = 0; var y
= 0 } var y = 0 val p = Point().apply { x = 3 y = 4 } println("p = (${p.x}, ${p.y})") // p = (3, 0) Λग़ྗ
➿剏周 BMTP class Point { var x = 0; var
y = 0 } var y = 0 val p = Point().also { it.x = 3 it.y = 4 } println("p = (${p.x}, ${p.y})") // p = (3, 4) Λग़ྗ
せ➰ֹ䒷侧
➿剏周 class Point { var x = 0; var y
= 0 } var y = 0 val p = Point().apply { x = 3 y = 4 } println("p = (${p.x}, ${p.y})") // p = (3, 0) Λग़ྗ
➿剏周 せ➰ֹ䒷侧 class Point(val x: Int, val y: Int) var
y = 0 val p = Point( x = 3, y = 4 ) println("p = (${p.x}, ${p.y})") // p = (3, 4) Λग़ྗ
猘鋅
BQQMZ ״BMTP ך倯ָ㸜Ⰻ
➙儗ךⶰ⡲欽ָ㼰זְ 鏣鎘أة؎ٕז ⢪ֲ堣⠓ָקרזְ
את
BQQMZ SVO XJUIכ MFU BMTPד➿欽
דְְךדכ
None
׀䠐鋅꧊⚥
ΤϯδχΞืूத ͓ؾܰʹ࿈བྷ͍ͩ͘͞ʂ