{"id":2568,"date":"2024-10-07T15:52:05","date_gmt":"2024-10-07T06:52:05","guid":{"rendered":"http:\/\/batmask.dothome.co.kr\/?p=2568"},"modified":"2024-10-07T15:52:05","modified_gmt":"2024-10-07T06:52:05","slug":"kotlin-%ec%97%90-%ec%9d%b5%ec%88%99%ed%95%b4%ec%a7%80%ea%b8%b0-%eb%82%af%ec%84%a0-%eb%ac%b8%eb%b2%95%eb%93%a4-%ec%a0%95%eb%a6%ac-3","status":"publish","type":"post","link":"http:\/\/batmask.net\/index.php\/2024\/10\/07\/2568\/","title":{"rendered":"Kotlin \uc5d0 \uc775\uc219\ud574\uc9c0\uae30 : \ub0af\uc120 \ubb38\ubc95\ub4e4 \uc815\ub9ac #3"},"content":{"rendered":"\n

\ub78c\ub2e4 \ud45c\ud604\uc2dd : https:\/\/kotlinlang.org\/docs\/lambdas.html<\/a><\/h3>\n\n\n\n

\ucf54\ud2c0\ub9b0\uc5d0\uc11c \ud568\uc218\ub294 first-class \uc774\ub2e4. \uc774 \uc758\ubbf8\ub294 \ud568\uc218\ub3c4 \uac1d\uccb4\ucc98\ub7fc \ubcc0\uc218\uc5d0 \uc800\uc7a5\ub3c4\ud558\uace0, \uc778\uc790\ub85c \ub118\uae30\uace0, \ub9ac\ud134\uac12\uc73c\ub85c \ub3cc\ub824\uc904 \uc218\ub3c4 \uc788\ub2e4\ub294 \uc598\uae30. \uc774\uc640\uac19\uc774 \ub2e4\ub8e8\uae30\uc704\ud574 \ud568\uc218 \ud0c0\uc785\uc758 \uc815\uc758\uac00 \ud544\uc694\ud55c\ub370 \ub2e4\uc74c\uacfc \uac19\uc774 \ud55c\ub2e4.<\/p>\n\n\n\n

<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
(Int, String) <\/span>-><\/span> String <\/span>\/\/ Int\uc640 String\ud0c0\uc785\uc758 \ub450 \uac1c\uc758 \uc778\uc790\ub97c \ubc1b\uace0 String\uc744 \ub9ac\ud134\ud558\ub294 \ud568\uc218<\/span><\/span>\n() <\/span>-><\/span> Unit <\/span>\/\/ \uc778\uc790\uac00 \uc5c6\uace0 \ub9ac\ud134\uac12\ub3c4 \uc5c6\ub294 \ud568\uc218<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\ub78c\ub2e4 \ud45c\ud604\uc2dd(Lambda expression)\uc740 \ud45c\ud604\uc2dd\uc774\uba74\uc11c \ud558\ub098\uc758 \ud568\uc218\ub85c syntax\uc608\uc81c\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
val<\/span> sum: (<\/span>Int<\/span>, <\/span>Int<\/span>) -> <\/span>Int<\/span> <\/span>=<\/span> { x:<\/span>Int<\/span>, y: <\/span>Int<\/span> -> <\/span>x<\/span> <\/span>+<\/span> y } <\/span>\/\/ \uc624\ub978\ucabd \uad04\ud638 \ubd80\ubd84\uc774 lambda expression<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\ub78c\ub2e4 \ud45c\ud604\uc2dd\uc740 \ud568\uc218\uc640 \ub611\uac19\uc774 \uc911\uad04\ud638\ub85c \ubb36\uc778\ub2e4. \ud30c\ub77c\ubbf8\ud130\ub97c \ub098\uc5f4\ud558\ub294 \uac83\uc73c\ub85c \uc2dc\uc791\ud558\uc5ec \ud654\uc0b4\ud45c ‘->’ \ub97c \uc4f0\uace0 \ud45c\ud604\uc2dd \ubc14\ub514\ubd80\ubd84\uc744 \uae30\uc220\ud55c\ub2e4. \ub9ac\ud134\uc774 \ub530\ub85c \ud45c\uc2dc\uac00 \uc5c6\uc9c0\ub9cc, \ud45c\ud604\uc2dd\uc778 \ub9cc\ud07c, \ub78c\ub2e4 \ud45c\ud604\uc2dd\uc740 \uc5ec\ub7ec\uc904\ub85c \uc0ac\uc6a9\ud560 \uc218\ub3c4 \uc788\uc73c\uba70, \ub9c8\uc9c0\ub9c9 \ud45c\ud604\uc2dd\uc758 \uac12\uc774 \ub9ac\ud134\uac12\uc774 \ub41c\ub2e4. \uc704 \uc608\uc5d0\uc120 x+y\uac12\uc774\ubbc0\ub85c \ub9ac\ud134\uac12\uc774 Int\uc774\ub2e4.<\/p>\n\n\n\n
\ud30c\ub77c\ubbf8\ud130\uac00 \uc5c6\ub2e4\uba74, \ud30c\ub77c\ubbf8\ud130\uc640 ‘->’ \ub97c \uc4f0\uc9c0 \uc54a\uc544\ub3c4 \ub41c\ub2e4. \ud30c\ub77c\ubbf8\ud130\uac00 \ud558\ub098\uc778 \uacbd\uc6b0\uc5d0\ub3c4 \uc0dd\ub7b5 \uac00\ub2a5\ud558\uba70, \uc774 \ub54c\ub294 \ubc14\ub514\ubd80\ubd84\uc5d0\uc11c “it”\uc73c\ub85c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4. \uc608\uc81c\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
ints.<\/span>filter<\/span> { it <\/span>><\/span> <\/span>0<\/span> } <\/span>\/\/ (it: Int) -> Boolean \ud0c0\uc785<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\ud30c\ub77c\ubbf8\ud130\uac00 \uc0ac\uc6a9\ub418\uc9c0 \uc54a\ub294 \uacbd\uc6b0, \uc5b8\ub354\uc2a4\ucf54\uc5b4 ‘_’\ub85c \uc790\ub9ac\ub97c \ucc44\uc6cc\ub193\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
map.<\/span>forEach<\/span> { (_, <\/span>value<\/span>) <\/span>-><\/span> <\/span>println<\/span>(<\/span>"<\/span>$value<\/span>!"<\/span>) }<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\"seperator\"<\/figure>\n\n\n\n
\ub9c8\uc9c0\ub9c9 \uc778\uc790\uac00 \ud568\uc218\uc778 \uacbd\uc6b0, \uad04\ud638 \ubc16\uc5d0 \ub78c\ub2e4 \ud45c\ud604\uc2dd\uc73c\ub85c \uc0ac\uc6a9\ud558\uae30. : https:\/\/kotlinlang.org\/docs\/lambdas.html#passing-trailing-lambdas<\/a><\/h3>\n\n\n\n
\ucf54\ud2c0\ub9b0\uc5d0\uc11c \ud568\uc218\uc758 \ub9c8\uc9c0\ub9c9 \uc778\uc790\uac00 \ud568\uc218 \ud0c0\uc785\uc778 \uacbd\uc6b0, \uc778\uc790\uc758 \uad04\ud638 \ubc16\uc5d0 \ub9c8\uce58 \ud568\uc218 \ubc14\ub514\ucc98\ub7fc \ub78c\ub2e4 \ud45c\ud604\uc2dd \uc0ac\uc6a9\uc774 \uac00\ub2a5\ud558\ub2e4. \ub78c\ub2e4 \ud45c\ud604\uc2dd \ud615\ud0dc\uc758 \ud568\uc218\uac00 \ub0b4\uc6a9\uc774 \uae38\uc5b4\uc9c8 \uc218 \uc788\uc73c\ubbc0\ub85c \ub9e4\uc6b0 \uc720\ud6a8\ud55c \ud615\ud0dc\uc774\ub2e4. <\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
\/\/ fold \ud568\uc218 \uc120\uc5b8\uc744 \ubcf4\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/span><\/span>\ninline<\/span> <\/span>fun<\/span> <<\/span>T<\/span>, <\/span>R<\/span>> <\/span>Array<\/span><<\/span>out T<\/span>><\/span>.<\/span>fold<\/span>(<\/span><\/span>\n    initial: <\/span>R<\/span>,<\/span><\/span>\n    operation: (<\/span>acc<\/span>: <\/span>R<\/span>, <\/span>T<\/span>) -> <\/span>R<\/span><\/span>\n): <\/span>R<\/span><\/span>\n<\/span>\n\/\/ fold \ud568\uc218\uc758 \uc0ac\uc6a9<\/span><\/span>\nval<\/span> product <\/span>=<\/span> items.<\/span>fold<\/span>(<\/span>1<\/span>) { acc, e <\/span>-><\/span> acc <\/span>*<\/span> e }<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\uc704 \uc608\uc5d0\uc11c \ud655\uc7a5 \ud568\uc218 fold()\uc758 \ub450\ubc88\uc9f8 \uc778\uc790\uac00 \ud568\uc218 \ud0c0\uc785\uc774\uace0, \uc2e4\uc81c \uc0ac\uc6a9\uc5d0\uc120 \ub78c\ub2e4 \ud45c\ud604\uc2dd\uc73c\ub85c \ub118\uaca8\uc8fc\uace0 \uc788\ub2e4. <\/p>\n\n\n\n
\"seperator\"<\/figure>\n\n\n\n
A.(B) -> C : https:\/\/kotlinlang.org\/docs\/lambdas.html#function-literals-with-receiver<\/a><\/h3>\n\n\n\n
\ubcf4\ub2e4\ubcf4\uba74 A.(B) -> C \uc640 \uac19\uc740 \ud615\ud0dc\uc758 \ud45c\ud604\uc744 \ubcf4\uac8c \ub418\ub294\ub370, \ub9ac\uc2dc\ubc84 \uc624\ube0c\uc81d\ud2b8\ub97c \uac00\uc9c0\ub294 \ud568\uc218 \ud0c0\uc785\uc774\ub2e4. \ub9ac\uc2dc\ubc84 \uc624\ube0c\uc81d\ud2b8\uc5d0 \uc9c1\uc811 \uc811\uadfc\ud55c\ub2e4\ub294 \ubd80\ubd84\uc5d0\uc11c \ud655\uc7a5\ud568\uc218\uc640 \uc720\uc0ac\ud558\ub2e4. <\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
val<\/span> sum: <\/span>Int<\/span>.(Int) <\/span>-><\/span> Int <\/span>=<\/span> { other <\/span>-><\/span> <\/span>plus<\/span>(other) }<\/span><\/span>\n<\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
 anonymous function\uc744 \uc774\uc6a9\ud558\uba74, \ub2e4\uc74c\uacfc \uac19\uc774 \uc0ac\uc6a9\ub3c4 \uac00\ub2a5\ud558\ub2e4.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
val<\/span> sum <\/span>=<\/span> <\/span>fun<\/span> <\/span>Int<\/span>.(other: <\/span>Int<\/span>): <\/span>Int<\/span> <\/span>=<\/span> <\/span>this<\/span> <\/span>+<\/span> other<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\ub78c\ub2e4 \ud45c\ud604\uc2dd\uc740 \ud568\uc218\uc640 \ub3d9\uc77c\ud558\ubbc0\ub85c, \uc704\uc758 \ud0c0\uc785\uc5d0 \ub300\uc785\ud558\uc5ec \uc0ac\uc6a9\uac00\ub2a5\ud558\ub2e4. \uc608\ub97c \ubcf4\uc790.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
class<\/span> <\/span>HTML<\/span> {<\/span><\/span>\n    <\/span>fun<\/span> <\/span>body<\/span>() { <\/span>..<\/span>. }<\/span><\/span>\n}<\/span><\/span>\n<\/span>\nfun<\/span> <\/span>html<\/span>(init: <\/span>HTML<\/span>.() <\/span>-><\/span> Unit): <\/span>HTML<\/span> {<\/span><\/span>\n    <\/span>val<\/span> html <\/span>=<\/span> <\/span>HTML<\/span>()  <\/span>\/\/ create the receiver object<\/span><\/span>\n    html.<\/span>init<\/span>()        <\/span>\/\/ pass the receiver object to the lambda<\/span><\/span>\n    <\/span>return<\/span> html<\/span><\/span>\n}<\/span><\/span>\n<\/span>\nhtml<\/span> {       <\/span>\/\/ lambda with receiver begins here<\/span><\/span>\n    <\/span>body<\/span>()   <\/span>\/\/ calling a method on the receiver object<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
 fun html\uc740 \uc778\uc790\ub85c \ub9ac\uc2dc\ubc84 \uc624\ube0c\uc81d\ud2b8 HTML\uc744 \uac16\ub294 \ud568\uc218 \ud0c0\uc785\uc744 \ubc1b\ub294\ub2e4. \ub9c8\uc9c0\ub9c9 \ubd80\ubd84\uc744 \ubcf4\uba74, body()\ub97c \uc2e4\ud589\ud558\ub294 \ub78c\ub2e4 \ud45c\ud604\uc2dd\uc744 \uc778\uc790\ub85c \ub118\uae30\uace0 \uc788\ub2e4. fun html() \ub0b4\ubd80\uc5d0\uc11c\ub294 \ub9ac\uc2dc\ubc84 \uc624\ube0c\uc81d\ud2b8\uc5d0 \uc774 \ub78c\ub2e4 \ud45c\ud604\uc2dd\uc744 \ubd99\uc5ec\uc11c \ub9ac\uc2dc\ubc84 \uc624\ube0c\uc81d\ud2b8\ub97c \uc804\ub2ec\ud558\uace0 \uc788\ub2e4. <\/p>\n\n\n\n
\"seperator\"<\/figure>\n\n\n\n
Null Safty : https:\/\/kotlinlang.org\/docs\/null-safety.html<\/a><\/h3>\n\n\n\n
\ucf54\ud2c0\ub9b0\uc740 null\uc5d0 \uc5c4\uaca9\ud55c \uc5b8\uc5b4\ub85c \ubcc0\uc218\uc5d0\uc11c null\uc774 \uac00\ub2a5\ud55c\uc9c0 \ubbf8\ub9ac \uc815\ud574\ub193\uace0 \uc2dc\uc791\ud55c\ub2e4. \ub610\ud55c, \uc774\ub7f0 null\uccb4\ud06c\ub97c \ub3c4\uc640\uc8fc\ub294 \uac83\ub4e4\uc774 \uc788\ub2e4. \uc774\ub7f0 \ubd80\ubd84\ub4e4\uc740 NPE( Null Pointer Exception)\uc744 \uc608\ubc29\ud558\ub294\ub370 \ud070 \ub3c4\uc6c0\uc774 \ub41c\ub2e4. <\/p>\n\n\n\n
\uc77c\ubc18\uc801\uc73c\ub85c \ubcc0\uc218\ub97c \uc120\uc5b8\ud558\uba74, \uc774 \ubcc0\uc218\ub4e4\uc740 Null\uc744 \uac16\uc744 \uc218 \uc5c6\ub2e4. <\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
\/\/ Assigns a non-null string to a variable<\/span><\/span>\nvar<\/span> a: <\/span>String<\/span> <\/span>=<\/span> <\/span>"abc"<\/span><\/span>\n<\/span>\n\/\/ Returns the length of a non-nullable variable<\/span><\/span>\nval<\/span> l <\/span>=<\/span> a.length<\/span><\/span>\nprint<\/span>(l)  <\/span>\/\/ 3<\/span><\/span>\n<\/span>\n\/\/ Attempts to re-assign null to the non-nullable variable<\/span><\/span>\na <\/span>=<\/span> <\/span>null<\/span><\/span>\nprint<\/span>(a)<\/span><\/span>\n\/\/ Null can not be a value of a non-null type String<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\uc704 \uc608\uc5d0\uc11c a  \ub294 null\uac12\uc744 \uc808\ub300 \uac16\uc9c0 \uc54a\uc73c\ubbc0\ub85c, a.length\ub97c \uc0ac\uc6a9\ud558\ub294\ub370 \uc544\ubb34\ub7f0 \uc704\ud5d8 \ubd80\ub2f4\uc774 \uc5c6\ub2e4. \ud558\uc9c0\ub9cc, \uc544\ub798\ucabd\uc5d0 null\uc744 \ub300\uc785\ud558\ub824 \ud55c\ub2e4\uba74 \uc5d0\ub7ec\uac00 \ub0a0 \uac83\uc774\ub2e4.<\/p>\n\n\n\n
null\uc774 \uac00\ub2a5\ud55c \ubcc0\uc218\ub294 ‘?’\ub97c \ub354\ud574\uc900\ub2e4.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
\/\/ Assigns a nullable string to a variable<\/span><\/span>\nvar<\/span> b: <\/span>String<\/span>? <\/span>=<\/span> <\/span>"abc"<\/span><\/span>\n\/\/ Successfully re-assigns null to the nullable variable<\/span><\/span>\nb <\/span>=<\/span> <\/span>null<\/span><\/span>\nprint<\/span>(b)<\/span><\/span>\n\/\/ null<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\ubb38\uc81c\ub294 \uc774\uc81c b\uc758 \uba64\ubc84\ub97c \ucc38\uc870\ud558\uac70\ub098 \ud560 \ub54c, NPE\uc758 \uc704\ud5d8\uc774 \uc0dd\uae30\uac8c \ub41c\ub2e4. \ub2e4\ub978 \uc5b8\uc5b4\uc5d0\uc11c \uac00\uc7a5 \uc27d\uac8c \ubcfc \uc218 \uc788\ub294 \ubc29\ubc95\uc740 if\ubb38\uc744 \uc774\uc6a9\ud55c null \uccb4\ud06c\uc77c \uac83\uc774\ub2e4. \uc5ec\uae30\uc120 \ud328\uc2a4. \ucf54\ud2c0\ub9b0\uc740 \ub354 \ub2e4\uc591\ud55c \ud574\uacb0\ucc45\uc744 \uc900\ub2e4. \uba3c\uc800 safe call operator \uc778 ‘?.’ \uc744 \uc81c\uacf5\ud55c\ub2e4. \uc774\ub294 \uba64\ubc84\ub97c \ucc38\uc870\ud558\uae30 \uc804\uc5d0 \uac1d\uccb4\uac00 null\uc774\uba74 \ucc38\uc870\ub97c \ud558\uc9c0\uc54a\uace0 \ubc14\ub85c null\uc744 \ub3cc\ub824\uc900\ub2e4.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
\/\/ Assigns a nullable string to a variable  <\/span><\/span>\nval<\/span> a: <\/span>String<\/span>? <\/span>=<\/span> <\/span>"Kotlin"<\/span><\/span>\n\/\/ Assigns null to a nullable variable<\/span><\/span>\nval<\/span> b: <\/span>String<\/span>? <\/span>=<\/span> <\/span>null<\/span><\/span>\n<\/span>\n\/\/ Checks for nullability and returns length or null<\/span><\/span>\nprintln<\/span>(a?.length)<\/span><\/span>\n\/\/ 6<\/span><\/span>\nprintln<\/span>(b?.length)<\/span><\/span>\n\/\/ null<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\ub2e4\uc74c\uc73c\ub85c Elvis operator ‘?:’ \uac00 \uc788\ub2e4. safe operator\ub294 \uac1d\uccb4\uac00 null\uc774\uba74 null\uc744 \ub3cc\ub824\uc92c\uc9c0\ub9cc, \uc774\uac74 null\uc774 \uc544\ub2cc \ub2e4\ub978\uac12\uc744 \ub3cc\ub824\uc900\ub2e4. <\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
\/\/ Assigns null to a nullable variable  <\/span><\/span>\nval<\/span> b: <\/span>String<\/span>? <\/span>=<\/span> <\/span>null<\/span><\/span>\n\/\/ Checks for nullability. If not null, returns length. If null, returns a non-null value<\/span><\/span>\nval<\/span> l <\/span>=<\/span> b?.length ?: <\/span>0<\/span><\/span>\nprintln<\/span>(l)<\/span><\/span>\n\/\/ 0<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\uc704\uc640 \uac19\uc774 \uc0ac\uc6a9\ud558\uba74, b?.length\uac00 null\uc774 \uc544\ub2c8\uba74 \uac12\uc744 \ub3cc\ub824\uc8fc\uace0 null\uc778 \uacbd\uc6b0 \uc624\ub978\ucabd\uc758 \uac12\uc778 0\ub97c \ub3cc\ub824\uc900\ub2e4.<\/p>\n\n\n\n
\uc138\ubc88\uc9f8\ub85c not-null assertion operator\uac00 \uc788\ub2e4. \uc774\ub294 null\uc774 \uac00\ub2a5\ud55c \ubcc0\uc218\uc5d0 \ub300\ud574 \uac1c\ubc1c\uc790\uac00 \ucef4\ud30c\uc77c\ub7ec\uc5d0\uac8c \uc5ec\uae30\uc11c\ub294 null\uc774 \ub420 \uc218 \uc5c6\uc74c\uc744 \uc54c\ub824\uc8fc\ub294 \uc5f0\uc0b0\uc790\uc774\ub2e4. \ub2e4\ub9cc, \uc798\ubabb\uc0ac\uc6a9\ud558\uba74 NPE \uc758 \uac00\ub2a5\uc131\uc774 \uc788\uc73c\ubbc0\ub85c \uc8fc\uc758\ud558\uc790.<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
\/\/ Assigns a nullable string to a variable  <\/span><\/span>\nval<\/span> b: <\/span>String<\/span>? <\/span>=<\/span> <\/span>"Kotlin"<\/span><\/span>\n\/\/ Treats b as non-null and accesses its length<\/span><\/span>\nval<\/span> l <\/span>=<\/span> b<\/span>!!<\/span>.length<\/span><\/span>\nprintln<\/span>(l)<\/span><\/span>\n\/\/ 6<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\ub78c\ub2e4 \ud45c\ud604\uc2dd : https:\/\/kotlinlang.org\/docs\/lambdas.html \ucf54\ud2c0\ub9b0\uc5d0\uc11c \ud568\uc218\ub294 first-class \uc774\ub2e4. \uc774 \uc758\ubbf8\ub294 \ud568\uc218\ub3c4 \uac1d\uccb4\ucc98\ub7fc \ubcc0\uc218\uc5d0 \uc800\uc7a5\ub3c4\ud558\uace0, \uc778\uc790\ub85c \ub118\uae30\uace0, \ub9ac\ud134\uac12\uc73c\ub85c \ub3cc\ub824\uc904 \uc218\ub3c4 \uc788\ub2e4\ub294 \uc598\uae30. \uc774\uc640\uac19\uc774 \ub2e4\ub8e8\uae30\uc704\ud574 \ud568\uc218 \ud0c0\uc785\uc758 \uc815\uc758\uac00 \ud544\uc694\ud55c\ub370 \ub2e4\uc74c\uacfc \uac19\uc774 \ud55c\ub2e4. \ub78c\ub2e4 \ud45c\ud604\uc2dd(Lambda expression)\uc740 \ud45c\ud604\uc2dd\uc774\uba74\uc11c \ud558\ub098\uc758 \ud568\uc218\ub85c syntax\uc608\uc81c\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4. \ub78c\ub2e4 \ud45c\ud604\uc2dd\uc740 \ud568\uc218\uc640 \ub611\uac19\uc774 \uc911\uad04\ud638\ub85c \ubb36\uc778\ub2e4. \ud30c\ub77c\ubbf8\ud130\ub97c \ub098\uc5f4\ud558\ub294 \uac83\uc73c\ub85c \uc2dc\uc791\ud558\uc5ec \ud654\uc0b4\ud45c \ub354 \uc77d\uae30<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,34],"tags":[38,41],"class_list":["post-2568","post","type-post","status-publish","format-standard","hentry","category-etc","category-kotlin","tag-kotlin","tag-kotlin-kr"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/posts\/2568","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/comments?post=2568"}],"version-history":[{"count":31,"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/posts\/2568\/revisions"}],"predecessor-version":[{"id":2618,"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/posts\/2568\/revisions\/2618"}],"wp:attachment":[{"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/media?parent=2568"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/categories?post=2568"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/batmask.net\/index.php\/wp-json\/wp\/v2\/tags?post=2568"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}