{"id":4063,"date":"2020-09-22T22:15:11","date_gmt":"2020-09-22T16:45:11","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=4063"},"modified":"2020-09-22T22:15:31","modified_gmt":"2020-09-22T16:45:31","slug":"defer-named-return-values-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/","title":{"rendered":"Defer function and Named Return Values in Go (Golang)"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/#Example\" title=\"Example\">Example<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">In case of named return value in the function, the defer function can read as well as modified those named return values. If the defer function modifies the name return value then that modified value will\u00a0 be returned<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s see a program for that<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example\"><\/span><strong>Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\nimport \"fmt\"\nfunc main() {\n    s := test()\n    fmt.Println(s)\n}\nfunc test() (size int) {\n    defer func() { size = 20 }()\n    size = 30\n    return\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">20<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">In the above program we have named return value <strong>&#8220;size&#8221;<\/strong>\u00a0 in the the test function. In the defer function we modify the name return value and we change the value to 20.\u00a0 We then set size to 30.\u00a0In the main function we print the return value of test function\u00a0 and it outputs 20 instead of 30 because defer function has modified the value of size variable in the test function<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewExample Overview In case of named return value in the function, the defer function can read as well as modified those named return values. If the defer function modifies&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4],"class_list":["post-4063","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Defer function and Named Return Values in Go (Golang) - Welcome To Golang By Example<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Defer function and Named Return Values in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewExample Overview In case of named return value in the function, the defer function can read as well as modified those named return values. If the defer function modifies...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/\" \/>\n<meta property=\"og:site_name\" content=\"Welcome To Golang By Example\" \/>\n<meta property=\"article:published_time\" content=\"2020-09-22T16:45:11+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-09-22T16:45:31+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/\",\"url\":\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/\",\"name\":\"Defer function and Named Return Values in Go (Golang) - Welcome To Golang By Example\",\"isPartOf\":{\"@id\":\"https:\/\/golangbyexamples.com\/#website\"},\"datePublished\":\"2020-09-22T16:45:11+00:00\",\"dateModified\":\"2020-09-22T16:45:31+00:00\",\"author\":{\"@id\":\"https:\/\/golangbyexamples.com\/#\/schema\/person\/8833ea7638dafd763cb1db6c0ca4576f\"},\"breadcrumb\":{\"@id\":\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/golangbyexamples.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Defer function and Named Return Values in Go (Golang)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/golangbyexamples.com\/#website\",\"url\":\"https:\/\/golangbyexamples.com\/\",\"name\":\"Welcome To Golang By Example\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/golangbyexamples.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/golangbyexamples.com\/#\/schema\/person\/8833ea7638dafd763cb1db6c0ca4576f\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/golangbyexamples.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/?s=96&d=mm&r=g\",\"caption\":\"admin\"},\"url\":\"https:\/\/golangbyexamples.com\/author\/admin\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Defer function and Named Return Values in Go (Golang) - Welcome To Golang By Example","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/","og_locale":"en_US","og_type":"article","og_title":"Defer function and Named Return Values in Go (Golang) - Welcome To Golang By Example","og_description":"Table of Contents OverviewExample Overview In case of named return value in the function, the defer function can read as well as modified those named return values. If the defer function modifies...","og_url":"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/","og_site_name":"Welcome To Golang By Example","article_published_time":"2020-09-22T16:45:11+00:00","article_modified_time":"2020-09-22T16:45:31+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"Written by":"admin","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/","url":"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/","name":"Defer function and Named Return Values in Go (Golang) - Welcome To Golang By Example","isPartOf":{"@id":"https:\/\/golangbyexamples.com\/#website"},"datePublished":"2020-09-22T16:45:11+00:00","dateModified":"2020-09-22T16:45:31+00:00","author":{"@id":"https:\/\/golangbyexamples.com\/#\/schema\/person\/8833ea7638dafd763cb1db6c0ca4576f"},"breadcrumb":{"@id":"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/golangbyexamples.com\/defer-named-return-values-golang\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/golangbyexamples.com\/"},{"@type":"ListItem","position":2,"name":"Defer function and Named Return Values in Go (Golang)"}]},{"@type":"WebSite","@id":"https:\/\/golangbyexamples.com\/#website","url":"https:\/\/golangbyexamples.com\/","name":"Welcome To Golang By Example","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/golangbyexamples.com\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/golangbyexamples.com\/#\/schema\/person\/8833ea7638dafd763cb1db6c0ca4576f","name":"admin","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/golangbyexamples.com\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/?s=96&d=mm&r=g","caption":"admin"},"url":"https:\/\/golangbyexamples.com\/author\/admin\/"}]}},"jetpack_featured_media_url":"","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paOs1b-13x","amp_validity":null,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/posts\/4063","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/comments?post=4063"}],"version-history":[{"count":2,"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/posts\/4063\/revisions"}],"predecessor-version":[{"id":4065,"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/posts\/4063\/revisions\/4065"}],"wp:attachment":[{"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/media?parent=4063"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/categories?post=4063"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/golangbyexamples.com\/wp-json\/wp\/v2\/tags?post=4063"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}