[kt]
\n\/\/\uc22b\uc790 \ud615\ud0dc\uc758 \ubb38\uc790\uc5f4\uc744 \uc22b\uc790\ub85c \ubc14\uafc0 \ub54c
\nval intStr = "10"
\nval str = Integer.patseInt(intStr)<\/p>\n
\/\/\uc77c\ubc18 \ud074\ub798\uc2a4\uac04\uc5d0 \ud615\ubcc0\ud658 \uc2dc as \uc0ac\uc6a9
\nopen class Animal
\nclass Dog : Animal()
\nval dog = Dog()
\nval animal = dog as Animal<\/p>\n
\/\/\uc22b\uc790\ud615 \uc790\ub8cc\ub07c\ub9ac \ud615 \ubcc0\ud658
\nval a = 10L
\nval b = 20<\/p>\n
val c = a.toInt()
\nval d = b.toDouble()
\nval e = a.toString()
\n[\/kt]<\/p>\n
[kt]
\n\/\/\ud615 \uccb4\ud06c, JAVA\uc758 instanceOf \uc5d0 \ud574\ub2f9\u3148
\nval str = "hello"<\/p>\n
if(str is String){
\n\tprintln(str.toUpperCase())
\n}
\n[\/kt]<\/p>\n
[kt]
\n\/\/let() \ud568\uc218
\n\/\/fun <T, R> T.let(block: (T) -> R): R
\nval result = str?.let {
\n\tInteger.parseInt(it)
\n}<\/p>\n
\/\/let \ud568\uc218\ub294 \ube14\ub85d\uc5d0 \uc790\uae30 \uc790\uc2e0\uc744 \uc778\uc218\ub85c \uc804\ub2ec\ud558\uace0 \uc218\ud589\ub41c \uacb0\uacfc\ub97c \ubc18\ud658\ud55c\ub2e4.
\n\/\/\uc778\uc218\ub85c \uc804\ub2ec\ud55c \uaca9\uccb4\ub294 it\uc73c\ub85c \ucc38\uc870\ud558\uba70, let\uc744 ?.\uacfc \ud568\uaf10 \uc0ac\uc6a9\ud558\uba74 null\uac12\uc774 \uc544\ub2d0 \ub54c\ub9cc \uc2e4\ud589\ud558\ub294 \ucf54\ub4dc\ub97c
\n\/\/\uc704\uc640 \uac19\uc774 \ub098\ud0c0\ub0bc \uc218 \uc788\ub2e4.
\n\/\/\uc704 \ucf54\ub4dc\ub294 str\uc774 null\uc774 \uc544\ub2d0 \uacbd\uc6b0\uc5d0\ub9cc \uc815\uc218\ub85c \ubcc0\uacbd\ud558\uc5ec \ucd9c\ub825\ud55c\ub2e4.
\n[\/kt]<\/p>\n
[kt]
\n\/\/with() \ud568\uc218
\n\/\/fun <T, R> with(receiver: T, block T.() -> R): R
\nwith(str){
\n\tprintln(toUpperCase())
\n}
\n\/\/with\ud568\uc218\ub294 \uc778\uc218\ub85c \uac1d\uccb4\ub97c \ubc1b\uace0 \ube14\ub85d\uc5d0 \ub9ac\uc2dc\ubc84 \uac1d\uccb4\ub85c \uc804\ub2ec\ud55c\ub2e4.
\n\/\/\uc218\ud589\ub41c \uacb0\uacfc\ub97c \ubc18\ud658\ud55c\ub2e4.
\n\/\/\ub9ac\uc2dc\ubc84 \uac1d\uccb4\ub85c \uc804\ub2ec\ub41c \uac1d\uccb4\ub294 this\ub85c \uc811\uadfc \uac00\ub2a5\ud558\ub2e4.
\n\/\/this\ub294 \uc0dd\ub7b5\uc774 \uac00\ub2a5\ud558\ubbc0\ub85c \uc704\uc640 \uac19\uc774 \uc791\uc131\uc774 \uac00\ub2a5\ud558\uba70, \uc548\uc804\ud55c \ud638\ucd9c\uc774 \ubd88\uac00\ud558\uc5ec str\uc774 null\uac12\uc774
\n\/\/\uc544\ub2d0 \uacbd\uc6b0\uc5d0\ub9cc \uc0ac\uc6a9\ud574\uc57c \ud55c\ub2e4.
\n[\/kt]<\/p>\n
[kt]
\n\/\/apply() \ud568\uc218
\n\/\/fun <T> T.apply(block: T.() -> Unit): T
\nval result = car?.apply {
\n\tcar.setColor(Color.RED)
\n\tcar.setPrice(1000)
\n}
\n\/\/apply\ud568\uc218\ub294 \ube14\ub85d\uc5d0 \uac1d\uccb4 \uc790\uc2e0\uc774 \ub9ac\uc2dc\ubc84 \uac1d\uccb4\ub85c \uc804\ub2ec\ub418\uace0 \uc774 \uac1d\uccb4\uac00 \ubc18\ud658\ub41c\ub2e4.
\n\/\/\uac1d\uccb4\uc758 \uc0c1\ud0dc\ub97c \ubcc0\ud654\uc2dc\ud0a4\uace0 \uadf8 \uac1d\uccb4\ub97c \ub2e4\uc2dc \ubc18\ud658\ud560 \ub54c \uc8fc\ub85c \uc0ac\uc6a9.
\n[\/kt]<\/p>\n
[kt]
\n\/\/run() \ud568\uc218
\n\/\/fun <R> run(block: () -> R): R
\nval avg = run {
\n\tval korean = 100
\n\tval english = 80
\n\tval math = 50<\/p>\n
\t(korean + english + math) \/ 3.0
\n}<\/p>\n
\/\/\uac1d\uccb4\uc5d0\uc11c \ud638\ucd9c\ud558\ub294 \ubc29\ubc95\uc740 \uac1d\uccb4\ub97c \ube14\ub85d\uc758 \ub9ac\uc2dc\ubc84 \uac1d\uccb4\ub85c \uc804\ub2ec\ud558\uace0 \ube14\ub85d\uc758 \uacb0\uacfc\ub97c \ubc18\ud658\ud55c\ub2e4.
\n\/\/\uc548\uc804\ud55c \ud638\ucd9c\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc5b4\uc11c with \ud568\uc218\ubcf4\ub2e4 \uc720\uc6a9\ud558\ub2e4.<\/p>\n
\/\/fun <T, R> T.run(block: T.() -> R): R
\nstr?.run {
\n\tprintln(toUpperCase())
\n}
\n[\/kt]<\/p>\n","protected":false},"excerpt":{"rendered":"
[kt] \/\/\uc22b\uc790 \ud615\ud0dc\uc758 \ubb38\uc790\uc5f4\uc744 \uc22b\uc790\ub85c \ubc14\uafc0 \ub54c val intStr = "10" val str = Integer.patseInt(intStr) \/\/\uc77c\ubc18 \ud074\ub798\uc2a4\uac04\uc5d0 \ud615\ubcc0\ud658 \uc2dc as \uc0ac\uc6a9 open class Animal class Dog : Animal() val dog = Dog() val animal = dog as Animal \/\/\uc22b\uc790\ud615 \uc790\ub8cc\ub07c\ub9ac \ud615 \ubcc0\ud658 val a = 10L val b = 20 val c = a.toInt() val … <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[349,7,4],"tags":[],"class_list":["post-698","post","type-post","status-publish","format-standard","hentry","category-kotlin","category-development","category-it"],"_links":{"self":[{"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=\/wp\/v2\/posts\/698","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=698"}],"version-history":[{"count":1,"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=\/wp\/v2\/posts\/698\/revisions"}],"predecessor-version":[{"id":700,"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=\/wp\/v2\/posts\/698\/revisions\/700"}],"wp:attachment":[{"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=698"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=698"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.itchefblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=698"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}