{"id":21,"date":"2026-06-09T08:11:00","date_gmt":"2026-06-09T01:11:00","guid":{"rendered":"http:\/\/cungdev.com\/?p=21"},"modified":"2026-06-09T08:11:00","modified_gmt":"2026-06-09T01:11:00","slug":"hieu-dung-ve-clean-code-va-cach-ap-dung-trong-du-an-thuc-te","status":"publish","type":"post","link":"https:\/\/cungdev.com\/?p=21","title":{"rendered":"Hi\u1ec3u \u0111\u00fang v\u1ec1 Clean Code v\u00e0 c\u00e1ch \u00e1p d\u1ee5ng trong d\u1ef1 \u00e1n th\u1ef1c t\u1ebf"},"content":{"rendered":"<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cungdev.com\/wp-content\/uploads\/2026\/06\/bc_11249_5852.jpg\" alt=\"\"\/><\/figure>\n<p>Kh\u00e1i ni\u1ec7m Clean Code \u0111\u01b0\u1ee3c nh\u1eafc \u0111\u1ebfn r\u1ea5t nhi\u1ec1u trong c\u1ed9ng \u0111\u1ed3ng l\u1eadp tr\u00ecnh, nh\u01b0ng kh\u00f4ng \u00edt ng\u01b0\u1eddi v\u1eabn hi\u1ec3u n\u00f3 m\u1ed9t c\u00e1ch h\u1eddi h\u1ee3t: ch\u1ec9 l\u00e0 \u0111\u1eb7t t\u00ean bi\u1ebfn \u0111\u1eb9p hay vi\u1ebft comment \u0111\u1ea7y \u0111\u1ee7. Tr\u00ean th\u1ef1c t\u1ebf, Clean Code l\u00e0 m\u1ed9t tri\u1ebft l\u00fd xuy\u00ean su\u1ed1t to\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m, n\u01a1i m\u00e3 ngu\u1ed3n \u0111\u01b0\u1ee3c vi\u1ebft kh\u00f4ng ch\u1ec9 \u0111\u1ec3 m\u00e1y hi\u1ec3u m\u00e0 c\u00f2n \u0111\u1ec3 con ng\u01b0\u1eddi \u0111\u1ecdc, s\u1eeda v\u00e0 m\u1edf r\u1ed9ng m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng. M\u1ed9t d\u00f2ng code s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ecdc l\u1ea1i h\u00e0ng ch\u1ee5c, th\u1eadm ch\u00ed h\u00e0ng tr\u0103m l\u1ea7n sau khi vi\u1ebft, n\u00ean kho\u1ea3n \u0111\u1ea7u t\u01b0 v\u00e0o s\u1ef1 r\u00f5 r\u00e0ng lu\u00f4n sinh l\u1eddi.<\/p>\n<h2>M\u00e3 s\u1ea1ch l\u00e0 m\u00e3 d\u1ec5 \u0111\u1ecdc tr\u01b0\u1edbc khi d\u1ec5 ch\u1ea1y<\/h2>\n<p>M\u1ed9t sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ee7a l\u1eadp tr\u00ecnh vi\u00ean m\u1edbi v\u00e0o ngh\u1ec1 l\u00e0 t\u1ed1i \u01b0u h\u00f3a qu\u00e1 s\u1edbm cho hi\u1ec7u n\u0103ng ho\u1eb7c cho s\u1ef1 ng\u1eafn g\u1ecdn. H\u1ecd d\u1ed3n nhi\u1ec1u ph\u00e9p to\u00e1n v\u00e0o m\u1ed9t d\u00f2ng, d\u00f9ng nh\u1eefng m\u1eb9o c\u00fa ph\u00e1p kh\u00f3 hi\u1ec3u \u0111\u1ec3 tr\u00f4ng th\u00f4ng minh h\u01a1n. Nh\u01b0ng ph\u1ea7n l\u1edbn chi ph\u00ed c\u1ee7a m\u1ed9t d\u1ef1 \u00e1n ph\u1ea7n m\u1ec1m kh\u00f4ng n\u1eb1m \u1edf l\u00fac vi\u1ebft m\u00e0 n\u1eb1m \u1edf l\u00fac b\u1ea3o tr\u00ec. Khi m\u1ed9t th\u00e0nh vi\u00ean m\u1edbi gia nh\u1eadp \u0111\u1ed9i, th\u1ee9 quy\u1ebft \u0111\u1ecbnh h\u1ecd l\u00e0m vi\u1ec7c hi\u1ec7u qu\u1ea3 sau m\u1ed9t tu\u1ea7n hay m\u1ed9t th\u00e1ng ch\u00ednh l\u00e0 m\u1ee9c \u0111\u1ed9 d\u1ec5 hi\u1ec3u c\u1ee7a m\u00e3 ngu\u1ed3n. V\u00ec v\u1eady, \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u c\u1ee7a Clean Code lu\u00f4n l\u00e0 kh\u1ea3 n\u0103ng \u0111\u1ecdc hi\u1ec3u.<\/p>\n<p>\u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111i\u1ec1u \u0111\u00f3, h\u00e3y b\u1eaft \u0111\u1ea7u t\u1eeb vi\u1ec7c \u0111\u1eb7t t\u00ean. M\u1ed9t c\u00e1i t\u00ean t\u1ed1t ph\u1ea3i n\u00f3i l\u00ean \u00fd \u0111\u1ecbnh, kh\u00f4ng c\u1ea7n ng\u01b0\u1eddi \u0111\u1ecdc ph\u1ea3i suy \u0111o\u00e1n. Bi\u1ebfn \u0111\u1ebfm s\u1ed1 ng\u01b0\u1eddi d\u00f9ng \u0111ang ho\u1ea1t \u0111\u1ed9ng n\u00ean l\u00e0 activeUserCount thay v\u00ec n hay temp. H\u00e0m ki\u1ec3m tra m\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 h\u1ee3p l\u1ec7 hay kh\u00f4ng n\u00ean l\u00e0 isOrderValid, tr\u1ea3 v\u1ec1 ki\u1ec3u boolean r\u00f5 r\u00e0ng. Khi t\u00ean \u0111\u00e3 \u0111\u1ee7 di\u1ec5n \u0111\u1ea1t, ph\u1ea7n l\u1edbn comment tr\u1edf n\u00ean th\u1eeba th\u00e3i, b\u1edfi b\u1ea3n th\u00e2n m\u00e3 ngu\u1ed3n \u0111\u00e3 t\u1ef1 gi\u1ea3i th\u00edch.<\/p>\n<h2>H\u00e0m nh\u1ecf v\u00e0 m\u1ed7i h\u00e0m ch\u1ec9 l\u00e0m m\u1ed9t vi\u1ec7c<\/h2>\n<p>Nguy\u00ean t\u1eafc quan tr\u1ecdng ti\u1ebfp theo l\u00e0 m\u1ed7i h\u00e0m ch\u1ec9 n\u00ean \u0111\u1ea3m nh\u1eadn m\u1ed9t tr\u00e1ch nhi\u1ec7m duy nh\u1ea5t. Khi m\u1ed9t h\u00e0m v\u1eeba truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u, v\u1eeba \u0111\u1ecbnh d\u1ea1ng d\u1eef li\u1ec7u, v\u1eeba g\u1eedi email, n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t kh\u1ed1i kh\u00f3 ki\u1ec3m th\u1eed v\u00e0 kh\u00f3 t\u00e1i s\u1eed d\u1ee5ng. T\u00e1ch n\u00f3 th\u00e0nh ba h\u00e0m nh\u1ecf gi\u00fap m\u1ed7i ph\u1ea7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ki\u1ec3m tra \u0111\u1ed9c l\u1eadp, \u0111\u1eb7t t\u00ean r\u00f5 r\u00e0ng v\u00e0 gh\u00e9p l\u1ea1i linh ho\u1ea1t. M\u1ed9t quy t\u1eafc kinh nghi\u1ec7m h\u1eefu \u00edch l\u00e0 n\u1ebfu b\u1ea1n ph\u1ea3i d\u00f9ng t\u1eeb v\u00e0 \u0111\u1ec3 m\u00f4 t\u1ea3 h\u00e0m \u0111ang l\u00e0m g\u00ec, r\u1ea5t c\u00f3 th\u1ec3 n\u00f3 \u0111ang l\u00e0m qu\u00e1 nhi\u1ec1u vi\u1ec7c.<\/p>\n<ul>\n<li>Gi\u1eef h\u00e0m ng\u1eafn, l\u00fd t\u01b0\u1edfng l\u00e0 v\u1eeba trong m\u1ed9t m\u00e0n h\u00ecnh \u0111\u1ec3 ng\u01b0\u1eddi \u0111\u1ecdc n\u1eafm tr\u1ecdn logic m\u00e0 kh\u00f4ng ph\u1ea3i cu\u1ed9n.<\/li>\n<li>H\u1ea1n ch\u1ebf s\u1ed1 l\u01b0\u1ee3ng tham s\u1ed1; qu\u00e1 nhi\u1ec1u tham s\u1ed1 th\u01b0\u1eddng l\u00e0 d\u1ea5u hi\u1ec7u n\u00ean gom ch\u00fang v\u00e0o m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n<li>Tr\u00e1nh t\u00e1c d\u1ee5ng ph\u1ee5 \u1ea9n, t\u1ee9c l\u00e0 h\u00e0m thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i b\u00ean ngo\u00e0i m\u00e0 t\u00ean g\u1ecdi kh\u00f4ng h\u1ec1 g\u1ee3i \u00fd.<\/li>\n<li>\u01afu ti\u00ean tr\u1ea3 v\u1ec1 s\u1edbm \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 l\u1ed3ng nhau c\u1ee7a c\u00e1c kh\u1ed1i \u0111i\u1ec1u ki\u1ec7n.<\/li>\n<\/ul>\n<h2>Comment n\u00ean gi\u1ea3i th\u00edch t\u1ea1i sao, kh\u00f4ng ph\u1ea3i c\u00e1i g\u00ec<\/h2>\n<p>Nhi\u1ec1u ng\u01b0\u1eddi l\u1ea7m t\u01b0\u1edfng r\u1eb1ng c\u00e0ng nhi\u1ec1u comment th\u00ec code c\u00e0ng chuy\u00ean nghi\u1ec7p. Th\u1ef1c ra comment m\u00f4 t\u1ea3 l\u1ea1i \u0111\u00fang nh\u1eefng g\u00ec code \u0111ang l\u00e0m l\u00e0 lo\u1ea1i comment t\u1ec7 nh\u1ea5t, v\u00ec n\u00f3 nhanh ch\u00f3ng l\u1ed7i th\u1eddi khi code thay \u0111\u1ed5i m\u00e0 kh\u00f4ng ai c\u1eadp nh\u1eadt ch\u00fa th\u00edch. Comment gi\u00e1 tr\u1ecb l\u00e0 comment gi\u1ea3i th\u00edch l\u00fd do \u0111\u1eb1ng sau m\u1ed9t quy\u1ebft \u0111\u1ecbnh: t\u1ea1i sao l\u1ea1i ch\u1ecdn thu\u1eadt to\u00e1n n\u00e0y d\u00f9 ch\u1eadm h\u01a1n, t\u1ea1i sao ph\u1ea3i b\u1ecf qua m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t, t\u1ea1i sao m\u1ed9t \u0111o\u1ea1n x\u1eed l\u00fd tr\u00f4ng k\u1ef3 l\u1ea1 l\u1ea1i c\u1ea7n thi\u1ebft \u0111\u1ec3 tr\u00e1nh m\u1ed9t l\u1ed7i \u0111\u00e3 t\u1eebng x\u1ea3y ra. Nh\u1eefng th\u00f4ng tin \u0111\u00f3 kh\u00f4ng th\u1ec3 \u0111\u1ecdc ra t\u1eeb ch\u00ednh c\u00e2u l\u1ec7nh.<\/p>\n<h2>\u0110\u1ecbnh d\u1ea1ng nh\u1ea5t qu\u00e1n v\u00e0 nguy\u00ean t\u1eafc Boy Scout<\/h2>\n<p>S\u1ef1 nh\u1ea5t qu\u00e1n trong c\u00e1ch tr\u00ecnh b\u00e0y t\u1ea1o ra c\u1ea3m gi\u00e1c chuy\u00ean nghi\u1ec7p v\u00e0 gi\u1ea3m g\u00e1nh n\u1eb7ng nh\u1eadn th\u1ee9c. H\u00e3y th\u1ed1ng nh\u1ea5t quy \u01b0\u1edbc th\u1ee5t l\u1ec1, c\u00e1ch \u0111\u1eb7t d\u1ea5u ngo\u1eb7c, th\u1ee9 t\u1ef1 khai b\u00e1o trong c\u1ea3 \u0111\u1ed9i v\u00e0 \u0111\u1ec3 c\u00f4ng c\u1ee5 \u0111\u1ecbnh d\u1ea1ng t\u1ef1 \u0111\u1ed9ng l\u00e0m ph\u1ea7n vi\u1ec7c n\u1eb7ng nh\u1ecdc. Khi m\u1ecdi t\u1ec7p tr\u00f4ng gi\u1ed1ng nhau, ng\u01b0\u1eddi \u0111\u1ecdc t\u1eadp trung v\u00e0o logic thay v\u00ec b\u1ecb ph\u00e2n t\u00e2m b\u1edfi kh\u00e1c bi\u1ec7t phong c\u00e1ch.<\/p>\n<p>Cu\u1ed1i c\u00f9ng, h\u00e3y ghi nh\u1edb nguy\u00ean t\u1eafc Boy Scout: lu\u00f4n \u0111\u1ec3 l\u1ea1i \u0111o\u1ea1n m\u00e3 s\u1ea1ch h\u01a1n l\u00fac b\u1ea1n t\u00ecm th\u1ea5y n\u00f3. M\u1ed7i l\u1ea7n ch\u1ea1m v\u00e0o m\u1ed9t t\u1ec7p, h\u00e3y \u0111\u1ed5i m\u1ed9t c\u00e1i t\u00ean m\u01a1 h\u1ed3, t\u00e1ch m\u1ed9t h\u00e0m d\u00e0i, x\u00f3a m\u1ed9t \u0111o\u1ea1n code ch\u1ebft. B\u1ea1n kh\u00f4ng c\u1ea7n m\u1ed9t \u0111\u1ee3t t\u00e1i c\u1ea5u tr\u00fac kh\u1ed5ng l\u1ed3; nh\u1eefng c\u1ea3i thi\u1ec7n nh\u1ecf t\u00edch l\u0169y qua th\u1eddi gian s\u1ebd gi\u1eef cho h\u1ec7 th\u1ed1ng kh\u1ecfe m\u1ea1nh. Clean Code kh\u00f4ng ph\u1ea3i \u0111\u00edch \u0111\u1ebfn m\u00e0 l\u00e0 th\u00f3i quen k\u1ef7 lu\u1eadt \u0111\u01b0\u1ee3c th\u1ef1c h\u00e0nh m\u1ed7i ng\u00e0y, v\u00e0 ph\u1ea7n th\u01b0\u1edfng c\u1ee7a n\u00f3 l\u00e0 m\u1ed9t codebase m\u00e0 c\u1ea3 \u0111\u1ed9i c\u1ea3m th\u1ea5y t\u1ef1 tin khi thay \u0111\u1ed5i.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kh\u00e1i ni\u1ec7m Clean Code \u0111\u01b0\u1ee3c nh\u1eafc \u0111\u1ebfn r\u1ea5t nhi\u1ec1u trong c\u1ed9ng \u0111\u1ed3ng l\u1eadp tr\u00ecnh, nh\u01b0ng kh\u00f4ng \u00edt ng\u01b0\u1eddi v\u1eabn hi\u1ec3u n\u00f3 m\u1ed9t c\u00e1ch h\u1eddi h\u1ee3t: ch\u1ec9 l\u00e0 \u0111\u1eb7t t\u00ean bi\u1ebfn \u0111\u1eb9p hay vi\u1ebft comment \u0111\u1ea7y \u0111\u1ee7. Tr\u00ean th\u1ef1c t\u1ebf, Clean Code l\u00e0 m\u1ed9t tri\u1ebft l\u00fd xuy\u00ean su\u1ed1t to\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m,&#8230;<\/p>\n","protected":false},"author":0,"featured_media":20,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-21","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chua-phan-loai"],"_links":{"self":[{"href":"https:\/\/cungdev.com\/index.php?rest_route=\/wp\/v2\/posts\/21","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cungdev.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cungdev.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/cungdev.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=21"}],"version-history":[{"count":0,"href":"https:\/\/cungdev.com\/index.php?rest_route=\/wp\/v2\/posts\/21\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cungdev.com\/index.php?rest_route=\/wp\/v2\/media\/20"}],"wp:attachment":[{"href":"https:\/\/cungdev.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cungdev.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cungdev.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}