RxJava AdventCalendarã®åæ¥ã¯ãliftã«ã¤ãã¦ãç´¹ä»ãã¾ãã åå¦è ãªã®ã§ééã£ãç解ãããããããã¾ãããããã®éã¯ã³ã¡ã³ããªã©ã§ãææé ããã¨å¹¸ãã§ãã ã¾ããä¸é¨èª¬æã®ç«¯æãé¨åãããã¨æãã¾ãããç°¡ç¥åã®ãããªã®ã§ãäºæ¿ä¸ãã liftã¨ã¯ãªã«ã Rxjavaã¯ã¡ã½ãããã§ã¼ã³ã§å¦çãç¹ãã¦æ¸ãã®ãä¸è¬çã§ããããã®ã¡ã½ãããã§ã¼ã³ãå®ç¾ãã¦ããã®ãliftã§ãã æ®æ®µã®éçºã§liftãè¦ããããã¨ã¯å°ãªãã¨æãã¾ãããmapãfilterãªã©æ®ã©ã®ãªãã¬ã¼ã¿ã¼ã®ä¸èº«ã¯liftã¨Operator<R, T> ã®çµã¿åããã§ä½ããã¦ãã¾ããliftãç解ããã¨ãèªåã§ã«ã¹ã¿ã ãªãã¬ã¼ã¿ã¼ãä½ããã¨ãåºæ¥ã¾ãã [Implementing Your Own Operators](https://github.com/ ReactiveX/RxJava/wiki/I
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