1. ã¯ããã«: Kotlinãšã¯
è¿å¹Žãããã°ã©ãã³ã°èšèªã®äžã§æ¥éã«äººæ°ãéããŠããKotlinããã®ååãèããããšãããæ¹ãå€ãã®ã§ã¯ãªãã§ããããããã®ã»ã¯ã·ã§ã³ã§ã¯ãKotlinã®åºæ¬çãªç¹åŸŽãããªãå€ãã®éçºè ãäŒæ¥ãKotlinãéžæããŠããã®ãã«ã€ããŠè§£èª¬ããŸãã
1.1 Kotlinã®ç¹åŸŽãšã¡ãªãã
Kotlinã¯ãJetBrainsãšããäŒç€Ÿãéçºããããã°ã©ãã³ã°èšèªã§ããJavaãšéåžžã«äŒŒãŠãããããJavaã®ç¥èãããæ¹ã¯Kotlinãããã«ç解ã§ããã§ããããããããKotlinã«ã¯Javaã«ã¯ãªãå€ãã®ç¹åŸŽããããŸãã
ãŸããKotlinã¯Nullå®å šããµããŒãããŠããŸããããã«ãããNullãã€ã³ã¿ã®ãšã©ãŒãå€§å¹ ã«æžå°ãããããšãã§ããŸãããŸããKotlinã®ææ³ã¯ç°¡æœã§ãããåãæ©èœãæã€ã³ãŒããæžãå ŽåãJavaãããå°ãªãè¡æ°ã§æžãããšãã§ããŸããããã«ãããã³ãŒããèªã¿ããããä¿å®ããããããªããŸãã
ããã«ãKotlinã¯Javaãšã®äºææ§ãé«ããããJavaã§æžãããã©ã€ãã©ãªããã¬ãŒã ã¯ãŒã¯ããã®ãŸãŸäœ¿çšããããšãã§ããŸããããã«ãããæ¢åã®Javaã®ãããžã§ã¯ãã«Kotlinãå°å ¥ããéã®ããŒãã«ãäœããªããŸãã
1.2 Kotlinãéžã°ããçç±
ã§ã¯ããªãå€ãã®éçºè ãäŒæ¥ãKotlinãéžæããŠããã®ã§ããããããã®çç±ã®äžã€ãšããŠãAndroidã®å ¬åŒéçºèšèªãšããŠGoogleãKotlinãæšå¥šããŠããããšãæããããŸããAndroidã¢ããªã®éçºã«ãããŠãKotlinã¯Javaãããå¹ççã«ããããŠå®å šã«ã³ãŒããæžãããšãã§ãããããå€ãã®Androidéçºè ãKotlinãéžæããŠããŸãã
ãŸããKotlinã¯ãµãŒããŒãµã€ãã®éçºã«ã䜿çšãããŠããŸããç°¡æœãªææ³ã匷åãªæ©èœã«ããããµãŒããŒãµã€ãã®ã¢ããªã±ãŒã·ã§ã³ã®éçºãå¹ççã«è¡ãããšãã§ããŸãã
æåŸã«ãKotlinã®ã³ãã¥ããã£ã掻çºã§ããããšã倧ããªçç±ã®äžã€ã§ããå€ãã®ã©ã€ãã©ãªãããŒã«ãéçºãããŠãããå°ã£ããšãã«ã¯ã³ãã¥ããã£ã®ãµããŒããåããããšãã§ããŸãã
以äžã®ãããªçç±ãããKotlinã¯å€ãã®å Žé¢ã§éžã°ããããã°ã©ãã³ã°èšèªãšãªã£ãŠããŸããããããã®æ代ãKotlinã®éèŠæ§ã¯ããã«é«ãŸãããšã§ãããã
2. Kotlinç°å¢æ§ç¯ã®åæç¥è
ããã°ã©ãã³ã°ãå§ããåã«ãKotlinã®ç°å¢æ§ç¯ã«å¿ èŠãªåºæ¬çãªç¥èã身ã«ã€ããããšãéèŠã§ãããã®ã»ã¯ã·ã§ã³ã§ã¯ãKotlinã®ç°å¢æ§ç¯ã«é¢é£ããäž»èŠãª3ã€ã®èŠçŽ ãJVMãJDKãããã³IDEã«ã€ããŠè©³ãã解説ããŸãã
2.1 JVMãšã¯
JVMïŒJava Virtual MachineïŒã¯ãJavaãã€ãã³ãŒããå®è¡ããããã®ä»®æ³ãã·ã³ã§ããJavaãKotlinã§æžãããããã°ã©ã ã¯ããŸããã€ãã³ãŒãã«ã³ã³ãã€ã«ããããã®JVMäžã§å®è¡ãããŸããJVMã®ãããã§ãJavaãKotlinã®ããã°ã©ã ã¯ãäžåºŠæžãã°ã©ãã§ãåãããšããç¹æ§ãæã£ãŠããŸããã€ãŸããç°ãªããã©ãããã©ãŒã ãOSã§åãã³ãŒããåå©çšããããšãã§ããŸãã
2.2 JDKãšã¯
JDKïŒJava Development KitïŒã¯ãJavaããã°ã©ã ãéçºããããã®ããŒã«ãããã§ããJDKã«ã¯ãJavaããã°ã©ã ãã³ã³ãã€ã«ããããã®ã³ã³ãã€ã©ããJVMãå«ãå®è¡ç°å¢ãªã©ãJavaéçºã«å¿ èŠãªããŒã«ãå«ãŸããŠããŸããKotlinãJavaãšäºææ§ããããããKotlinã®ç°å¢æ§ç¯ã«ãJDKãå¿ èŠãšãªããŸãã
2.3 IDEãšã¯
IDEïŒIntegrated Development EnvironmentïŒã¯ãããã°ã©ã ã®éçºãå©ããããã®çµ±åéçºç°å¢ã§ããã³ãŒãã®èšè¿°ããããã°ããã¹ãããããã€ãªã©ãéçºã«é¢é£ããããŸããŸãªã¿ã¹ã¯ãäžå çã«è¡ãããšãã§ããŸããKotlinã®éçºã«ã¯ãJetBrainsãéçºããIntelliJ IDEAãåºã䜿çšãããŠããŸãããã®IDEã¯ãKotlinã®ã³ãŒãè£å®ããããã°æ©èœãªã©ãKotlinéçºã«ç¹åããæ©èœãå€æ°åããŠããŸãã
以äžã®3ã€ã®èŠçŽ ã¯ãKotlinã®ç°å¢æ§ç¯ã«ãããŠéåžžã«éèŠã§ãã次ã®ã»ã¯ã·ã§ã³ã§ã¯ããããã®ç¥èãåºã«ãå®éã®ç°å¢æ§ç¯ã®æé ã«ã€ããŠè©³ãã解説ããŸãã
3. Kotlinç°å¢æ§ç¯ã®ã¹ããããã€ã¹ãããã¬ã€ã
ããã°ã©ãã³ã°ã®åŠç¿ãå§ããéãç°å¢æ§ç¯ã¯æåã®å€§ããªå£ãšãªãããšãå€ãã§ããããããæ£ããæé ãèžãã°ãã¹ã ãŒãºã«ç°å¢ãæŽããããšãã§ããŸãããã®ã»ã¯ã·ã§ã³ã§ã¯ãKotlinã®ç°å¢æ§ç¯ã®åºæ¬çãªæé ãã¹ããããã€ã¹ãããã§è§£èª¬ããŸãã
3.1 JDKã®ã€ã³ã¹ããŒã«æ¹æ³
ãŸãæåã«ãJDKïŒJava Development KitïŒã®ã€ã³ã¹ããŒã«ãå¿ èŠã§ããKotlinã¯Javaãšäºææ§ããããããJavaã®å®è¡ç°å¢ãæŽããããšãåæãšãªããŸãã
ã€ã³ã¹ããŒã«ã®æé ã¯ä»¥äžã®éãã§ãïŒ
1. Oracleã®å ¬åŒãµã€ããããææ°ã®JDKãããŠã³ããŒãããŸãã
2. ããŠã³ããŒããããã¡ã€ã«ãå®è¡ããæ瀺ã«åŸã£ãŠã€ã³ã¹ããŒã«ãé²ããŸãã
3. ã€ã³ã¹ããŒã«ãå®äºããããã³ãã³ãããã³ãããã¿ãŒããã«ãéãããjava -versionããšå ¥åããŠãæ£ããã€ã³ã¹ããŒã«ãããããšã確èªããŸãã
3.2 IntelliJ IDEAã®å°å ¥
次ã«ãKotlinã®éçºã«é©ããIDEãIntelliJ IDEAãå°å ¥ããŸããIntelliJ IDEAã¯ãKotlinã®éçºã«ç¹åããå€æ°ã®æ©èœãæã€ãããå¹ççã«ã³ãŒããæžãããšãã§ããŸãã
å°å ¥ã®æé ã¯ä»¥äžã®éãã§ãïŒ
1. JetBrainsã®å ¬åŒãµã€ããããIntelliJ IDEAãããŠã³ããŒãããŸãã
2. ããŠã³ããŒããããã¡ã€ã«ãå®è¡ããæ瀺ã«åŸã£ãŠã€ã³ã¹ããŒã«ãé²ããŸãã
3. ã€ã³ã¹ããŒã«ãå®äºããããIntelliJ IDEAãèµ·åããåæèšå®ãè¡ããŸãã
3.3 Kotlinãã©ã°ã€ã³ã®èšå®
IntelliJ IDEAã«ã¯ãããã©ã«ãã§Kotlinã®ãã©ã°ã€ã³ãå«ãŸããŠããŸãããææ°ã®ããŒãžã§ã³ã«æŽæ°ããããšãããããããŸãã
ãã©ã°ã€ã³ã®èšå®æ¹æ³ã¯ä»¥äžã®éãã§ãïŒ
1. IntelliJ IDEAãèµ·åããPreferencesãŸãã¯SettingsãéããŸãã
2. å·ŠåŽã®ã¡ãã¥ãŒãããPluginsããéžæããæ€çŽ¢ããã¯ã¹ã«ãKotlinããšå ¥åããŸãã
3. Kotlinãã©ã°ã€ã³ã衚瀺ãããããææ°ã®ããŒãžã§ã³ã«æŽæ°ããŸãã
ããã§ãKotlinã®ç°å¢æ§ç¯ã¯å®äºã§ãã次ã®ã»ã¯ã·ã§ã³ã§ã¯ãå®éã«Kotlinã®ããã°ã©ã ãæžããŠå®è¡ããæ¹æ³ã«ã€ããŠè§£èª¬ããŸãã
4. Kotlinãããžã§ã¯ãã®äœæãšå®è¡
ç°å¢æ§ç¯ãå®äºãããã次ã¯Kotlinã®ãããžã§ã¯ããäœæããå®éã«ã³ãŒããæžããŠå®è¡ããŠã¿ãŸãããããã®ã»ã¯ã·ã§ã³ã§ã¯ããããžã§ã¯ãã®äœæããå®è¡ãããã«ã¯èšå®ã®ã«ã¹ã¿ãã€ãºæ¹æ³ãŸã§ã解説ããŸãã
4.1 æ°ãããããžã§ã¯ãã®äœæ
ãŸããIntelliJ IDEAãèµ·åãããNew ProjectããéžæããŸãããããžã§ã¯ãã¿ã€ããšããŠãKotlinããéžã³ããããžã§ã¯ãã®ååãä¿åå ãæå®ããŸããããã§ãæ°ããKotlinãããžã§ã¯ããäœæãããŸãã
4.2 ãµã³ãã«ã³ãŒãã®å®è¡
æ°ãããããžã§ã¯ããäœæãããšãMain.ktãšããååã®ãã¡ã€ã«ãèªåçã«çæãããŸãããã®ãã¡ã€ã«ã«ã¯ãç°¡åãªãµã³ãã«ã³ãŒããæžãããŠããŸãããã®ã³ãŒããå®è¡ããŠãæ£ããåäœããã確èªããŸãããã
ã³ãŒãã®å®è¡ã¯ãç»é¢äžéšã®ç·è²ã®äžè§ãã¿ã³ãã¯ãªãã¯ããããšã§è¡ããŸããæ£ããå®è¡ããããšãã³ã³ãœãŒã«ã«ãHello, World!ããšè¡šç€ºãããŸãã
4.3 ãããžã§ã¯ãã®èšå®ãšã«ã¹ã¿ãã€ãº
Kotlinãããžã§ã¯ãã®èšå®ã¯ããFileãã¡ãã¥ãŒãããProject Structureããéžæããããšã§è¡ããŸããããã§ã¯ã䜿çšããKotlinã®ããŒãžã§ã³ããé¢é£ããã©ã€ãã©ãªã®èšå®ãªã©ãè¡ãããšãã§ããŸãã
ãŸããIntelliJ IDEAã«ã¯ãã³ãŒãã®æžãæ¹ããµããŒãããå€æ°ã®æ©èœãåãã£ãŠããŸããäŸãã°ãã³ãŒãè£å®æ©èœã䜿çšãããšãå ¥åäžã®ã³ãŒãã«åãããŠé¢é£ããããŒã¯ãŒããã¡ãœããåãèªåçã«ææ¡ããŠãããŸããããã«ãããå¹ççã«ã³ãŒããæžãããšãã§ããŸãã
ããã«ããªãã¡ã¯ã¿ãªã³ã°æ©èœã䜿çšãããšãã³ãŒãã®æ§é ãå€æŽããããšãªããã³ãŒãã®å質ãåäžãããããšãã§ããŸãããããã®æ©èœã掻çšããŠãããé«å質ãªKotlinã®ã³ãŒããæžãããšãã§ããŸãã
以äžã§ãKotlinãããžã§ã¯ãã®äœæããå®è¡ãèšå®ã®ã«ã¹ã¿ãã€ãºæ¹æ³ãŸã§ã解説ããŸããã次ã®ã»ã¯ã·ã§ã³ã§ã¯ãKotlinã®éçºã«åœ¹ç«ã€ããŒã«ãã©ã€ãã©ãªã«ã€ããŠè©³ãã解説ããŸãã
5. Kotlinã®éçºããŒã«ãšã©ã€ãã©ãª
Kotlinã®éçºãå¹ççã«é²ããããã«ã¯ãé©åãªããŒã«ãã©ã€ãã©ãªã®ç¥èãæ¬ ãããŸããããã®ã»ã¯ã·ã§ã³ã§ã¯ãKotlinéçºã«åœ¹ç«ã€ããŒã«ãã©ã€ãã©ãªããããŠãããã°ã®æ¹æ³ã«ã€ããŠè©³ãã解説ããŸãã
5.1 䟿å©ãªKotlinã©ã€ãã©ãªã®çŽ¹ä»
Kotlinã®ã³ãã¥ããã£ã¯éåžžã«æŽ»çºã§ãå€ãã®ã©ã€ãã©ãªãéçºãããŠããŸãã以äžã¯ãKotlinéçºã«ç¹ã«åœ¹ç«ã€ã©ã€ãã©ãªã®äžéšã§ãã
Kotlinx.coroutinesã¯ãéåæåŠçãç°¡åã«å®è£ ããããã®ã©ã€ãã©ãªã§ããããã䜿çšããããšã§ãéåæåŠçãã·ã³ãã«ãã€å¹ççã«å®è£ ããããšãã§ããŸãã
Ktorã¯ãKotlinã§ã®Webã¢ããªã±ãŒã·ã§ã³éçºããµããŒããããã¬ãŒã ã¯ãŒã¯ã§ããã·ã³ãã«ãªAPIãšé«ãæ¡åŒµæ§ãæã£ãŠããŸãã
ãããã®ã©ã€ãã©ãªã¯ãKotlinã®éçºãããã«å¹ççã«é²ããããã®åŒ·åãªããŒã«ãšãªããŸãã
5.2 ãã«ãããŒã«: GradleãšMaven
ãã«ãããŒã«ã¯ããããžã§ã¯ãã®ãã«ããäŸåé¢ä¿ã®ç®¡çãå©ããããŒã«ã§ããKotlinã®ãããžã§ã¯ãã§ã¯ãGradleãMavenããã䜿çšãããŸãã
Gradleã¯ãKotlinã®å ¬åŒãµã€ãã§ãæšå¥šãããŠãããã«ãããŒã«ã§ããDSLïŒDomain Specific LanguageïŒã䜿çšããŠãã«ãã¹ã¯ãªãããèšè¿°ããããšãã§ããé«ãæ¡åŒµæ§ãæã£ãŠããŸãã
MavenããŸããJavaã®ãããžã§ã¯ãã§åºã䜿çšãããŠãããã«ãããŒã«ã§ããKotlinã®ãã©ã°ã€ã³ã䜿çšããããšã§ãMavenã§ã®Kotlinãããžã§ã¯ãã®ãã«ããå¯èœã§ãã
5.3 ãããã°ãšãã©ãã«ã·ã¥ãŒãã£ã³ã°
ããã°ã©ã ã®ãã°ãåé¡ã解決ããããã®ãããã°ã¯ãéçºã®éèŠãªã¹ãããã§ããIntelliJ IDEAã«ã¯ãKotlinã®ã³ãŒãã®ãããã°ããµããŒããã匷åãªãããã¬ãçµã¿èŸŒãŸããŠããŸãã
ãããã¬ã䜿çšããããšã§ãã³ãŒãã®å®è¡ãäžæåæ¢ãããããå€æ°ã®å€ã確èªãããããããšãã§ããŸããããã«ãããåé¡ã®åå ãè¿ éã«ç¹å®ããä¿®æ£ããããšãã§ããŸãã
ãŸããIntelliJ IDEAã«ã¯ãã³ãŒãã®å質ããã§ãã¯ããéç解æããŒã«ãåãã£ãŠããŸããããã䜿çšããããšã§ãã³ãŒãã®åé¡ç¹ãæ¹åç¹ãèªåçã«æ€åºããããšãã§ããŸãã
以äžã§ãKotlinã®éçºããŒã«ãã©ã€ãã©ãªããããã°ã®æ¹æ³ã«ã€ããŠã®è§£èª¬ãçµäºããŸãããããã®ç¥èã掻çšããŠãããå¹ççãªKotlinã®éçºãé²ããŠãã ããã
6. Kotlinã§ã®ãã¹ããã©ã¯ãã£ã¹
Kotlinã¯ãJavaãšã®äºææ§ãæã¡ãªããããããã·ã³ãã«ã§å¹ççãªã³ãŒãã£ã³ã°ãå¯èœã«ããèšèªã§ãããããããã®æ©èœãæ倧éã«æŽ»çšããããã«ã¯ããã¹ããã©ã¯ãã£ã¹ã®ç¥èãå¿ èŠã§ãããã®ã»ã¯ã·ã§ã³ã§ã¯ãKotlinã§ã®ã³ãŒãã£ã³ã°ã®ãã¹ããã©ã¯ãã£ã¹ã«ã€ããŠè©³ãã解説ããŸãã
6.1 ã³ãŒãã£ã³ã°ã¹ã¿ã€ã«ãšæ £ç¿
Kotlinã®ã³ãŒãã£ã³ã°ã¹ã¿ã€ã«ã¯ãèªã¿ããããšäžè²«æ§ãéèŠããŠããŸããå ¬åŒã®ã¹ã¿ã€ã«ã¬ã€ãã«åŸãããšã§ãä»ã®éçºè ãšã®ã³ãŒãã®å ±æãããŒã ã§ã®éçºãã¹ã ãŒãºã«é²ãã§ãããã
åœåèŠåïŒå€æ°ãé¢æ°ã¯ãã£ã¡ã«ã±ãŒã¹ã䜿çšããã¯ã©ã¹åã¯å€§æåå§ãŸãã®ãã£ã¡ã«ã±ãŒã¹ã䜿çšããŸããå®æ°ã¯å€§æåã®ã¹ããŒã¯ã±ãŒã¹ã䜿çšããŸãã
ã€ã³ãã³ãïŒã¹ããŒã¹4ã€ã䜿çšããã¿ãã¯äœ¿çšããªãããã«ããŸãã
ãããã®åºæ¬çãªã«ãŒã«ãå®ãããšã§ãã³ãŒãã®èªã¿ããããåäžããŸãã
6.2 ããã©ãŒãã³ã¹ãšæé©å
Kotlinã¯é«éãªå®è¡é床ãæã£ãŠããŸãããæé©ãªã³ãŒããæžãããšã§ãããªãããã©ãŒãã³ã¹ã®åäžãæåŸ ã§ããŸãã
äŸãã°ãã©ã ãåŒãæ¡åŒµé¢æ°ã掻çšããããšã§ãã³ãŒãã®åé·æ§ãæžå°ãããèªã¿ãããå¹ççãªã³ãŒããæžãããšãã§ããŸãã
ãŸããã€ã³ã©ã€ã³é¢æ°ã䜿çšããããšã§ãã©ã³ã¿ã€ã ã®ãªãŒããŒããããæžå°ãããããšãã§ããŸãã
6.3 ã»ãã¥ãªãã£ã®ãã³ã
ãœãããŠã§ã¢ã®ã»ãã¥ãªãã£ã¯ãéçºã®éã«åžžã«èæ ®ãã¹ãéèŠãªèŠçŽ ã§ããKotlinã§ããã»ãã¥ã¢ãªã³ãŒããæžãããã®ãã³ãããã¯ããã¯ããããŸãã
äŸãã°ãnullå®å šã®æ©èœã掻çšããããšã§ãnullåç §ã®äŸå€ãåé¿ããããšãã§ããŸãããŸããããŒã¿ã¯ã©ã¹ã䜿çšããããšã§ãäžå€ãªãªããžã§ã¯ããäœæããããŒã¿ã®å®å šæ§ãåäžãããããšãã§ããŸãã
ãããã®ãã¹ããã©ã¯ãã£ã¹ã掻çšããããšã§ãã»ãã¥ã¢ã§å¹ççãªKotlinã®ã³ãŒããæžãããšãã§ããŸãã
以äžã§ãKotlinã§ã®ãã¹ããã©ã¯ãã£ã¹ã«ã€ããŠã®è§£èª¬ãçµäºããŸãããããã®ç¥èã掻çšããŠãããé«å質ãªKotlinã®ã³ãŒããæžãããšãç®æããŸãããã
7. ãŸãšããšæ¬¡ã®ã¹ããã
ãã®èšäºãéããŠãKotlinã®ç°å¢æ§ç¯ãããã¹ããã©ã¯ãã£ã¹ãŸã§ã®è©³çŽ°ãªã¬ã€ããæäŸããŸãããæåŸã«ããããŸã§ã®å 容ããŸãšããKotlinã®åŠç¿ãããã«é²ããããã®ãªãœãŒã¹ããä»åŸã®Kotlinã®ãã¬ã³ãã«ã€ããŠè§ŠããŠãããŸãã
7.1 ç°å¢æ§ç¯ã®ãã§ãã¯ãªã¹ã
å¹æçãªKotlinã®éçºç°å¢ãæ§ç¯ããããã®äž»ãªã¹ããããå確èªããŸãããã
1. JDKã®ã€ã³ã¹ããŒã«: Kotlinã¯JVMäžã§åäœãããããJDKã®ã€ã³ã¹ããŒã«ã¯å¿ é ã§ãã
2. IntelliJ IDEAã®å°å ¥: Kotlinã®éçºã«æé©åãããIDEã§ãå€ãã®äŸ¿å©ãªæ©èœãæäŸããŠããŸãã
3. Kotlinãã©ã°ã€ã³ã®èšå®: IntelliJ IDEAã«Kotlinã®ãµããŒããè¿œå ããããã®ã¹ãããã§ãã
7.2 KotlinåŠç¿ã®ããã®ãªãœãŒã¹
Kotlinã®åŠç¿ãããã«æ·±ããããã®ãªãœãŒã¹ãšããŠã以äžã®ãã®ãããããã§ãã
Kotlinå ¬åŒããã¥ã¡ã³ã: Kotlinã®åºæ¬ããé«åºŠãªãããã¯ãŸã§ã詳现ãªæ å ±ãæäŸãããŠããŸãã
Kotlin Koans: å®è·µçãªåé¡ã解決ããªããKotlinãåŠã¶ããšãã§ãããªã³ã©ã€ã³ã®åŠç¿ãªãœãŒã¹ã§ãã
Kotlinã³ãã¥ããã£: ãã©ãŒã©ã ãSlackãã£ã³ãã«ãªã©ãä»ã®Kotlinéçºè ãšã®äº€æµãæ·±ããå ŽããããŸãã
7.3 ä»åŸã®Kotlinã®ãã¬ã³ã
Kotlinã¯ãAndroidã®å ¬åŒèšèªãšããŠã®å°äœã確ç«ããŠä»¥æ¥ãæ¥éã«æ®åããŠããŸãããŸãããµãŒããŒãµã€ããWebããã³ããšã³ããããã«ã¯ãã€ãã£ãã¢ããªã±ãŒã·ã§ã³ã®éçºã«ã察å¿ããŠããŸãã
ä»åŸããKotlin Multiplatformã®ãããªã¯ãã¹ãã©ãããã©ãŒã ã®éçºããµããŒãããæ©èœã匷åãããããšãæåŸ ãããŸãããŸããKotlinã®ã³ãã¥ããã£ãæ¥ã æé·ããŠãããæ°ããã©ã€ãã©ãªããã¬ãŒã ã¯ãŒã¯ã®ç»å Žãç¶ããŠããŸãã
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