{"id":4520,"date":"2026-06-24T07:00:00","date_gmt":"2026-06-23T22:00:00","guid":{"rendered":"https:\/\/litcoder.com\/?p=4520"},"modified":"2026-05-30T22:38:18","modified_gmt":"2026-05-30T13:38:18","slug":"rust-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%98%eb%b0%8d-%ec%bd%94%eb%93%9c-%ea%b0%80%eb%8f%85%ec%84%b1%ec%9d%84-%eb%86%92%ec%9d%b4%ea%b8%b0-%ec%9c%84%ed%95%9c-and_then-%ed%99%9c%ec%9a%a9","status":"publish","type":"post","link":"https:\/\/litcoder.com\/?p=4520","title":{"rendered":"Rust \ud504\ub85c\uadf8\ub798\ubc0d, \ucf54\ub4dc \uac00\ub3c5\uc131\uc744 \ub192\uc774\uae30 \uc704\ud55c and_then() \ud65c\uc6a9"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Rust\ub294 \uc120\uc5b8\uc801 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uc801\uadf9\uc801\uc73c\ub85c \uc0ac\uc6a9\ud558\uae30\uc5d0 method chaining\uc744 \ub9ce\uc774 \uc0ac\uc6a9\ud558\ub294\ub370 \uc774\ub294 \uac00\ub3c5\uc131\uc744 \ub192\uc774\uace0 \ucef4\ud30c\uc77c\ub7ec\uac00 \ucd5c\uc801\ud654\ub97c \uc218\ud589\ud558\ub294\ub370 \uc801\ud569\ud55c \ud615\ud0dc\uc774\uae30 \ub54c\ubb38\uc774\ub2e4. \uc774 \ud3ec\uc2a4\ud305\uc5d0\uc11c\ub294 method chaining\uc744 \uc720\uc9c0\ud558\uba74\uc11c\ub3c4 \uc911\ucca9\ub41c <code>Result<\/code> \ud639\uc740 <code>Option<\/code> \ud615\uc2dd\uc744 \ud53c\ud560 \uc218 \uc788\ub294 <code>and_then()<\/code>\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf8\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">match \ubb38\uc744 \uc774\uc6a9\ud55c \ucc98\ub9ac<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc138\uac1c\uc758 \ud568\uc218 \uac01\uac01\uc774 \ub2e4\uc74c\uacfc \uac19\uc774 <code>Result<\/code>\ub97c \ubc18\ud658\ud55c\ub2e4\uace0 \ud574\ubcf4\uc790.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"rust\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">use std::io::{Error, ErrorKind};\n\n\/\/\/ 1. \uc785\ub825\ub41c \uc0ac\uc6a9\uc790 JSON \uac80\uc99d, \ube48 \ubb38\uc790\uc5f4\uc774 \uc544\ub2c8\uba74 Ok \ubc18\ud658.\nfn validate_json(raw: &amp;str) -> Result&lt;&amp;str, Error> {\n  if raw.is_empty() {\n    Err(Error::new(ErrorKind::InvalidData, \"empty user input\"))\n  } else {\n    Ok(raw)\n  }\n}\n\n\/\/\/ 2. \uc0ac\uc6a9\uc790 id \ubc18\ud658\nfn get_user_id(username: &amp;str) -> Result&lt;u32, Error> {\n  if username == \"admin\" {\n    Ok(1)\n  } else {\n    Err(Error::new(ErrorKind::NotFound, \"user not found\"))\n  }\n}\n\n\/\/\/ 3. \ud1a0\ud070 \uc0dd\uc131\nfn generate_token(user_id: u32) -> Result&lt;String, Error> {\n  if user_id == 1 {\n    Ok(format!(\"token_for_user_{}\", user_id))\n  } else {\n    Err(Error::new(ErrorKind::InvalidInput, \"user id unavailable\"))\n  }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac01 \ud568\uc218\ub4e4\uc740 1. \uc720\ud6a8\ud55c JSON\uc778\uc9c0 \ud310\ubcc4\ud558\uace0, 2. \uc0ac\uc6a9\uc790\ub97c \uac80\uc0c9\ud574\uc11c id\ub97c \ubc18\ud658\ud55c \ud6c4, 3. \ud574\ub2f9 \uc0ac\uc6a9\uc790\uc5d0 \ub300\ud55c \ud1a0\ud070\uc744 \uc0dd\uc131\ud574\uc11c \ubc18\ud658\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub97c <code>match<\/code> \ubb38\uc744 \uc774\uc6a9\ud574\uc11c \ucc98\ub9ac \ud558\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 \ub420 \uac83\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"rust\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">fn main() {\n  let raw_input = \"admin\";\n\n  \/\/ 1. JSON \uc720\ud6a8\uc131 \ud310\ubcc4\n  match validate_json(raw_input) {\n    Ok(user) => {\n      \/\/ 2. \uc720\ud6a8\ud558\uba74 \uc0ac\uc6a9\uc790 id \uac80\uc0c9\n      match get_user_id(user) {\n        Ok(id) => {\n          \/\/ 3. \uc0ac\uc6a9\uc790\uac00 \uc720\ud6a8\ud558\uba74 \ud1a0\ud070 \uc0dd\uc131\n          match generate_token(id) {\n            Ok(tok) => {\n              \/\/ \ud1a0\ud070 \ucd9c\ub825\n              println!(\"{:?}\", tok);\n            },\n            \/\/ \ud1a0\ud070 \uc0dd\uc131\uc2dc \uc5d0\ub7ec \ucc98\ub9ac\n            Err(e) => eprint!(\"Error: {e}\")\n          }\n        },\n        \/\/ \uc720\ud6a8\ud558\uc9c0 \uc54a\uc740 \uc0ac\uc6a9\uc790\n        Err(e) => eprint!(\"Error: {e}\")\n      }\n    },\n    \/\/ JSON\uc774 \uc720\ud6a8\ud558\uc9c0 \uc54a\uc74c\n    Err(e) => eprint!(\"Error: {e}\")\n    }\n  }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ubaa8\ub4e0 <strong>match arm<\/strong>\ub4e4\uc744 \uba85\uc2dc\ud574\uc57c \ud558\ub294 match \uad6c\ubb38\uc758 \uc81c\uc57d \ub54c\ubb38\uc5d0 <code>Result<\/code>\uc758 <code>Ok<\/code>\uc640 <code>Err<\/code>\uc5d0 \ub300\ud55c \uacbd\uc6b0\ub97c \ubaa8\ub450 \uc801\uc5b4 \uc8fc\uc5b4\uc57c \ud558\uace0 \uc774 \ub54c\ubb38\uc5d0 \ucf54\ub4dc\uac00 \uc7a5\ud669\ud558\uace0 \uac00\ub3c5\uc131\uc774 \ub5a8\uc5b4\uc9c4\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">map() \ud65c\uc6a9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\uc804\uc758 &#8220;<a href=\"https:\/\/litcoder.com\/?p=4374\" data-type=\"link\" data-id=\"https:\/\/litcoder.com\/?p=4374\">Rust \ud504\ub85c\uadf8\ub798\ubc0d\uc5d0\uc11c map() \ud65c\uc6a9<\/a>&#8221; \uc5d0\uc11c \uc5b8\uae09 \ud588\ub4ef\uc774 <code>map()<\/code>\uc740 container\ubfd0\ub9cc \uc544\ub2c8\ub77c <code>Result<\/code>\ub098 <code>Option<\/code>\uc758 <code>Ok<\/code> \/ <code>Some<\/code>\uc778 \uacbd\uc6b0 \ub3d9\uc791\uc744 \uc815\uc758\ud558\ub294\ub370 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4. \ub530\ub77c\uc11c <code>map()<\/code>\uc744 \uc774\uc6a9\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 \uc791\uc131\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"rust\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">fn main() {\n  let raw_input = \"admin\";\n\n  let tok = validate_json(raw_input)\n      .map(|user| get_user_id(user)\n      .map(|id| generate_token(id)));\n\n  \/\/ Ok(Ok(Ok(\"token_for_user_1\")))\n  print!(\"{:?}\", tok);\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ubcf4\uae30\uc5d0\ub294 \ud6e8\uc52c \uae54\ub054\ud574 \uc84c\uc9c0\ub9cc, \uac01 \ud568\uc218\ub4e4\uc774 <code>Result<\/code>\ub97c \ubc18\ud658\ud558\uae30 \ub54c\ubb38\uc5d0 <code>tok<\/code>\ubcc0\uc218\uc758 type\uc774 <code>Result&lt;Result&lt;Result&lt;String, ...>, ...>, ...><\/code> \uac19\uc740 \uc5ec\ub7ec\ubc88 \uc911\ucca9\ub41c \ud615\uc2dd\uc774 \ub418\uc5b4 \uc5ec\ub7ec\ubc88 unwrap \ud574\uc8fc\uc5b4\uc57c \ud558\ub294 \ubcf4\uae30 \uc2eb\uc740 \ud615\ud0dc\uac00 \ub41c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">and_then() \ud65c\uc6a9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub807\uac8c method chaining\uc73c\ub85c \uc911\ucca9\ub41c <code>Result<\/code>\ub098 <code>Option<\/code>\uc774 \ubc18\ud658\ub418\ub294 \uacbd\uc6b0\uc5d0\ub294 <code>and_then()<\/code>\uc744 \uc0ac\uc6a9\ud574\ubcf4\uc790.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"rust\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">fn main() {\n  let raw_input = \"admin\";\n\n  let tok = validate_json(raw_input)\n      .and_then(|user| get_user_id(user))\n      .and_then(|id| generate_token(id));\n \n  \/\/ Ok(\"token_for_user_1\")  \n  print!(\"{:?}\", tok);\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub807\uac8c method chaining\uc744 \ud558\uba74 \uc911\ubcf5\ub41c \ubc18\ud658\ud615\uc2dd \ub4e4\uc774 \ubaa8\ub450 \uc81c\uac70\ub418\uace0 <code>Result&lt;String, Error> <\/code>\ud615\uc2dd\uc73c\ub85c <code>tok<\/code> \ubcc0\uc218\uac00 \ubc18\ud658\ub418\uc5b4 \ud6e8\uc52c \uac00\ub3c5\uc131 \ub192\uc740 \ucf54\ub4dc\ub97c \uc720\uc9c0\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\uacb0\ub860<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>map()<\/code>\uacfc <code>and_then()<\/code>\uc740 \ubaa8\ub450 Rust\uc758 \uc120\uc5b8\ud615 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uac00\ub2a5\ud558\uac8c \ud558\ub294 \uc911\uc694\ud55c \uc694\uc18c\ub85c \ube44\uc2b7\ud574 \ubcf4\uc774\uc9c0\ub9cc, closure\uac00 \ubb34\uc5c7\uc744 \ubc18\ud658\ud558\ub294\uac00\uc5d0 \ub530\ub77c \uadf8 \ud65c\uc6a9\uc774 \ub2ec\ub77c\uc9c4\ub2e4.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>map(): \ub0b4\ubd80 \uac12\uc758 \ud615\ud0dc\ub9cc \ubc14\uafc0\ub54c(\uc2e4\ud328 \uac00\ub2a5\uc131\uc774 \uc5c6\ub294 \ub2e8\uc21c \ubcc0\ud658)<\/li>\n\n\n\n<li>and_then(): \ubcc0\ud658 \uacfc\uc815\uc5d0\uc11c \ub610 \ub2e4\ub978 <code>Option<\/code>\uc774\ub098 <code>Result<\/code>\uac00 \ubc1c\uc0dd\ud560 \ub54c(\uc2e4\ud328 \uac00\ub2a5\uc131\uc774 \uc788\ub294 \uc5f0\uc1c4 \uc791\uc5c5)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ub3d9\uc77c\ud55c \ucf54\ub4dc\ub97c <code>match<\/code>\ub098 <code>if let<\/code>\uc73c\ub85c \uc791\uc131\ud560 \uc218\ub3c4 \uc788\uc9c0\ub9cc, \uc774\ub978\ubc14 &#8220;match hell&#8221;\uc758 \uc870\uc9d0\uc774 \ubcf4\uc774\uace0 \uadf8\ub85c \uc778\ud574 \ucf54\ub4dc\uc758 \uac00\ub3c5\uc131\uc774 \ub5a8\uc5b4\uc9c4\ub2e4\uba74 <code>and_then()<\/code>\uc744 \ud65c\uc6a9\ud574 \ubcf4\uc790.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rust\ub294 \uc120\uc5b8\uc801 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uc801\uadf9\uc801\uc73c\ub85c \uc0ac\uc6a9\ud558\uae30\uc5d0 method chaining\uc744 \ub9ce\uc774 \uc0ac\uc6a9\ud558\ub294\ub370 \uc774\ub294 \uac00\ub3c5\uc131\uc744 \ub192\uc774\uace0 \ucef4\ud30c\uc77c\ub7ec\uac00 \ucd5c\uc801\ud654\ub97c \uc218\ud589\ud558\ub294\ub370 \uc801\ud569\ud55c \ud615\ud0dc\uc774\uae30 \ub54c\ubb38\uc774\ub2e4. \uc774 \ud3ec\uc2a4\ud305\uc5d0\uc11c\ub294 method chaining\uc744 \uc720\uc9c0\ud558\uba74\uc11c\ub3c4 \uc911\ucca9\ub41c Result \ud639\uc740 Option \ud615\uc2dd\uc744 \ud53c\ud560 \uc218 \uc788\ub294 and_then()\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf8\ub2e4. match \ubb38\uc744 \uc774\uc6a9\ud55c \ucc98\ub9ac \uc138\uac1c\uc758 \ud568\uc218 \uac01\uac01\uc774 \ub2e4\uc74c\uacfc \uac19\uc774 Result\ub97c \ubc18\ud658\ud55c\ub2e4\uace0 \ud574\ubcf4\uc790. \uac01 \ud568\uc218\ub4e4\uc740 1. \uc720\ud6a8\ud55c JSON\uc778\uc9c0 \ud310\ubcc4\ud558\uace0, 2. \uc0ac\uc6a9\uc790\ub97c \uac80\uc0c9\ud574\uc11c [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[5],"tags":[450,432,442,451,423],"class_list":["post-4520","post","type-post","status-publish","format-standard","hentry","category-programming","tag-and_then","tag-map","tag-programming","tag-readability","tag-rust"],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":4528,"url":"https:\/\/litcoder.com\/?p=4528","url_meta":{"origin":4520,"position":0},"title":"Rust unittest\ub97c \uc704\ud55c \uc758\uc874\uc131 \uaca9\ub9ac","author":"litcoder","date":"2026\ub144 9\uc6d4 2\uc77c","format":false,"excerpt":"\ub2e4\ud589\ud788\ub3c4 \uc6b0\ub9ac\ub294 unittest\uc758 \uc720\uc6a9\ud568 \uc798 \uc54c\ub824\uc9c4 \uc2dc\ub300\uc5d0 \uc0b4\uace0 \uc788\uae30\uc5d0 \ub354 \uc774\uc0c1 unittest\ub97c \uc9c0\uc6d0\ud558\ub294 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub97c \ud2b9\ubcc4\ud558\uac8c \ubc1b\uc544\ub4e4\uc774\uc9c0 \uc54a\ub294\ub2e4. Rust\ub294 \ube44\uad50\uc801 \ucd5c\uc2e0 \uc5b8\uc5b4\uc778 \ub9cc\ud07c \uc774\ub7ec\ud55c \uc694\uad6c\uc0ac\ud56d\ub4e4\uc744 \uc801\uadf9\uc801\uc73c\ub85c \ubc1b\uc544\ub4e4\uc5ec \ubd80\uac00\uc801\uc778 \ud504\ub808\uc784\uc6cc\ud06c\uc758 \ub3c4\uc6c0 \uc5c6\uc774\ub3c4 \uc5b8\uc5b4 \uc790\uccb4\uc5d0\uc11c \uae30\ubcf8\uc801\uc778 unittest\uac00 \uc798 \uc9c0\uc6d0\ub41c\ub2e4. \ub2e4\ub9cc, Rust\ub294 \uc0c1\uc18d\uc744 \uc9c0\uc6d0\ud558\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0 Python, Java, C++ \uac19\uc740 \uac1d\uccb4\uc9c0\ud5a5 \uc5b8\uc5b4\uc5d0\uc11c \uc758\uc874\uc131\uc744\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4374,"url":"https:\/\/litcoder.com\/?p=4374","url_meta":{"origin":4520,"position":1},"title":"Rust \ud504\ub85c\uadf8\ub798\ubc0d\uc5d0\uc11c map() \ud65c\uc6a9","author":"litcoder","date":"2026\ub144 5\uc6d4 13\uc77c","format":false,"excerpt":"Python\uc774 \uadf8\ub7ec\ud558\ub4ef Rust\ub3c4 declarative programming(\uc120\uc5b8\ud615 \ud504\ub85c\uadf8\ub798\ubc0d)\uc744 \uc9c0\uc6d0\ud55c\ub2e4. \uadf8 \uc911 map()\uc740 \uc774\ub7ec\ud55c \ucf54\ub529\uc2a4\ud0c0\uc77c\uc758 \ub300\ud45c\ucc98\ub7fc \uc0ac\uc6a9\ub418\uace0\ub294 \ud558\ub294\ub370, \uc774\uac83\uc744 \uc774\uc6a9\ud558\uba74 \uae38\uace0 \uc7a5\ud669\ud55c \ucf54\ub4dc\ub97c \uac04\uacb0\ud558\uac8c \ub098\ud0c0\ub0bc \uc218 \uc788\ub2e4. \uae30\ubcf8\uc801 \uc0ac\uc6a9\ubc95 1 \ubd80\ud130 10\uae4c\uc9c0 1\uc529 \uc99d\uac00\ud558\ub294 \uac12\uc744 \uac00\uc9c4 i32 \ud615\uc758 10\uce78\uc9dc\ub9ac \ubc30\uc5f4 arr\uc774 \uc788\ub2e4\uace0 \ud560 \ub54c, \uadf8 \uc548\uc5d0 \uc788\ub294 \uac01 \uc6d0\uc18c\ub4e4\uc5d0 2\ub97c \uacf1\ud558\ub294 \ucf54\ub4dc\uc774\ub2e4. \/\/\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3939,"url":"https:\/\/litcoder.com\/?p=3939","url_meta":{"origin":4520,"position":2},"title":"gRPC Streaming\uc73c\ub85c \uc0c1\ud0dc \uc804\uc1a1 \ubc1b\uae30 \uc608\uc81c","author":"litcoder","date":"2026\ub144 7\uc6d4 29\uc77c","format":false,"excerpt":"gRPC\uc5d0\uc11c Observer pattern\uc744 \uad6c\ud604\ud558\ub294 \uc608\uc81c\ub97c \uace0\ubbfc\ud588\ub358 \uc801\uc774 \uc788\uc5c8\ub294\ub370(gRPC\ub97c \uc774\uc6a9\ud55c Observer Pattern) \uc54c\uace0\ubcf4\ub2c8 gRPC\uc5d0\uc11c\ub294 ReadReactor \/ WriteReactor \ubcf4\ub2e4 \uac04\ub2e8\ud558\uac8c object\uc758 \uc0c1\ud0dc \ubcc0\uacbd\uc744 \uac10\uc9c0\ud560 \uc218 \uc788\ub294 \uba54\ucee4\ub2c8\uc998\uc744 \uc81c\uacf5\ud558\uace0 \uc788\uc5c8\ub2e4. gRPC\ub97c \uc774\uc6a9\ud55c Observer pattern \uad6c\ud604 \uc608\uc81c\ub97c \ucc3e\uae30 \uc5b4\ub824\uc6e0\ub358 \uc774\uc720\uac00 \uc5b4\uca4c\uba74 \uadf8\ub7f0 \ubcf5\uc7a1\ud55c \ud328\ud134 \uc5c6\uc774\ub3c4 \uad6c\ud604\uc774 \uac00\ub2a5\ud558\uae30 \ub54c\ubb38\uc774\uc5c8\ub294\uc9c0\ub3c4 \ubaa8\ub974\uaca0\ub2e4. \uc774 \ud3ec\uc2a4\ud305\uc5d0\uc11c\ub294 Stream\uc744 \ud1b5\ud574 \ubcc0\uacbd\ub418\ub294\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/07\/Screenshot-2026-07-10-at-6.34.33-PM.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/07\/Screenshot-2026-07-10-at-6.34.33-PM.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/07\/Screenshot-2026-07-10-at-6.34.33-PM.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/07\/Screenshot-2026-07-10-at-6.34.33-PM.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":4281,"url":"https:\/\/litcoder.com\/?p=4281","url_meta":{"origin":4520,"position":3},"title":"Rust: comparison is useless due to type limits","author":"litcoder","date":"2026\ub144 6\uc6d4 17\uc77c","format":false,"excerpt":"\"\ud0c0\uc785 \uc81c\ud55c \ub54c\ubb38\uc5d0 \uc774 \ube44\uad50\uc5f0\uc0b0\uc740 \uc4f8.\ubaa8.\uc5c6.\ub2e4.\" IndexSet\uc774 \ud558\ub098 \uc788\ub2e4\uace0 \ud560 \ub54c, \uadf8 \uc548\uc5d0 \ud558\ub098\ub77c\ub3c4 \uc544\uc774\ud15c\uc774 \uc788\uc73c\uba74 true\ub97c \ubc18\ud658\ud558\uace0 \uc544\ub2c8\uba74 false\ub97c \ubc18\ud658\ud558\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 Rust code\ub97c \uc0dd\uac01\ud574 \ubcf4\uc790. use indexmap::IndexSet; fn has_item(item_set: &IndexSet<String>) -> bool { item_set.iter().count() >= 0 } \uac04\ub2e8\ud558\uac8c unittest\uc5d0 \ub123\uc5b4\uc11c \uc0c8\ub85c \uc0dd\uc131\ud574\uc11c \uc544\ubb34 \uc6d0\uc18c\ub3c4 \uc5c6\ub294 IndexSet\uc744 \ud558\ub098 \ub9cc\ub4e4\uc5b4\uc11c\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/05\/rust_unused_comparisons.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":4025,"url":"https:\/\/litcoder.com\/?p=4025","url_meta":{"origin":4520,"position":4},"title":"OpenVINO Object Detection Model\uc758 \uc804\ucc98\ub9ac\uc640 \ud6c4\ucc98\ub9ac\ub97c \uac04\ub2e8\ud558\uac8c","author":"litcoder","date":"2026\ub144 1\uc6d4 28\uc77c","format":false,"excerpt":"AI model\ub4e4\uc740 \uc785\ucd9c\ub825 layer\uc758 \uad6c\uc870\uac00 \ub2e4\ub974\ubbc0\ub85c \uc11c\ub85c \ub2e4\ub978 pre\/post processing\uc744 \ud544\uc694\ub85c \ud55c\ub2e4. Vision model\uc744 \uc608\ub85c \ub4e4\uba74 \uc5b4\ub5a4 \ubaa8\ub378\uc740 \uc785\ub825\uc744 416x416\uc73c\ub85c \ubc1b\uac8c \ub418\uc5b4 \uc788\uc5b4\uc11c \uc785\ub825 \uc804\uc5d0 \uc6d0\ubcf8 \ud06c\uae30\ub85c \ubd80\ud130 resizing\uc744 \ud574\uc8fc\uc5b4\uc57c \ud558\uace0, \uc5b4\ub5a4 \ubaa8\ub378\uc740 resizing layer\uc744 \ud3ec\ud568\ud558\uace0 \uc788\uc5b4\uc11c \uadf8\ub0e5 \uc785\ub825\ud574\ub3c4 \uc798 \ub3d9\uc791\ud558\uae30\ub3c4 \ud55c\ub2e4. \ub610\ud55c \uc5b4\ub5a4 \ubaa8\ub378\uc740 \uc785\ub825\uac12\uc744 \uc815\uaddc\ud654 \ud574\uc11c \uc785\ub825\ud574 \uc8fc\uc5b4\uc57c\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3509,"url":"https:\/\/litcoder.com\/?p=3509","url_meta":{"origin":4520,"position":5},"title":"gRPC\ub97c \uc774\uc6a9\ud55c Observer Pattern","author":"litcoder","date":"2024\ub144 10\uc6d4 14\uc77c","format":false,"excerpt":"Remote\uc5d0\uc11c \uc81c\uacf5\ud558\ub294 \uae30\ub2a5\uc744 \ub9c8\uce58 local system\uc758 function call \ucc98\ub7fc \uc81c\uacf5 \ud55c\ub2e4\ub294 gRPC\uc758 \uac1c\ub150 \uc790\uccb4\ub294 1990\ub144\ub300\uc5d0\ub3c4 \uc788\uc5c8\ub358 \uac83\uc774\uae30\uc5d0 \uc0c8\ub85c\uc6b8 \uac83\uc740 \uc5c6\uc9c0\ub9cc, \uadf8 \uc704\uc5d0\uc11c \"Subject\uc758 \ubcc0\uacbd\uc774 \uc788\uc744 \ub54c subscriber\uc5d0\uac8c notify \ud574\uc8fc\ub294 Observer Pattern\uc744 \uc5b4\ub5bb\uac8c \uad6c\ud604 \ud560 \uc218 \uc788\uc744\uae4c?\"\ud558\ub294 \uc758\ubb38\uc774 \ub4e4\uc5c8\ub2e4. \uc774 \ud3ec\uc2a4\ud305\uc5d0\uc11c\ub294 gRPC\ub97c \uc774\uc6a9\ud55c observer pattern\uc758 \uc608\uc81c\ub85c server\uc5d0\uc11c \uc784\uc758\uc758 \uc8fc\uc2dd\uacfc \uadf8 \ubcc0\ub3d9\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2024\/10\/grpc_observer.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2024\/10\/grpc_observer.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2024\/10\/grpc_observer.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2024\/10\/grpc_observer.png?resize=700%2C400&ssl=1 2x"},"classes":[]}],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/posts\/4520","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/litcoder.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4520"}],"version-history":[{"count":7,"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/posts\/4520\/revisions"}],"predecessor-version":[{"id":4527,"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/posts\/4520\/revisions\/4527"}],"wp:attachment":[{"href":"https:\/\/litcoder.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4520"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/litcoder.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4520"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/litcoder.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4520"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}