{"id":40,"date":"2019-03-28T15:53:41","date_gmt":"2019-03-28T15:53:41","guid":{"rendered":"https:\/\/www.kindsonthegenius.com\/javascript\/?p=40"},"modified":"2020-08-06T06:02:23","modified_gmt":"2020-08-06T06:02:23","slug":"07-javascript-switch-statement","status":"publish","type":"post","link":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/","title":{"rendered":"JavaScript – Switch Statement"},"content":{"rendered":"

Previously we discussed if-statement under Conditional Statements<\/a>. Now, you could have several if-else-if statements. But this is not always the best solution. Hence, there is an alternative to this. That is the Switch Statement.<\/p>\n

 <\/p>\n

How the Switch Statement Works<\/strong><\/p>\n

You can use the switch statement to\u00a0 replace repeated if-else-if statements.<\/p>\n

The flowchart of the switch statement is given below.<\/p>\n

 <\/p>\n

\"Switch<\/p>\n

 <\/p>\n

Syntax<\/strong><\/h4>\n

I consists of a switch statement and a number of case statements.<\/p>\n

Each case statement is followed by a corresponding block of code (statement). The interpreter checks each case statement against the value of the switch expression. If a match is found, then the particular case statement is executed.<\/p>\n

If no match is found for all the case statements, then the default statement is executed.<\/p>\n

 <\/p>\n

The syntax of the Switch statement is given below.<\/p>\n

<\/p>\n

switch (expression) {\r\n   case condition 1: statement 1\r\n   break;\r\n   \r\n   case condition 2: statement 2\r\n   break;\r\n   ...\r\n   \r\n   case condition n: statement n\r\n   break;\r\n   \r\n   default: default statement\r\n}\r\n<\/pre>\n
 <\/p>\n
Also notice the break<\/strong> statement. It’s just a single line. Just one word: break. This is used to exit the switch statement. So once a match is found and the statement is executed, then the break statement exits the switch statement.<\/p>\n
 <\/p>\n
Switch Statement Example<\/strong><\/h4>\n
An example of switch statement is given in the html file below.<\/p>\n
 <\/p>\n
<html><\/span>\r\n<head><title><\/span>Switch Statement Example<\/title><\/head><\/span>\r\n   <body><\/span>\r\n   \r\n      <script <\/span>type =<\/span> \"text\/javascript\"<\/span>><\/span>\r\n         <!--<\/span>\r\n            var<\/span> grade =<\/span> 'B'<\/span>;\r\n            document<\/span>.write(\"Entering switch statement block<br \/>\"<\/span>);\r\n            switch<\/span> (grade) {\r\n               case<\/span> 'A'<\/span>:<\/span> document<\/span>.write(\"Excellent<br \/>\"<\/span>);\r\n               break<\/span>;\r\n            \r\n               case<\/span> 'B'<\/span>:<\/span> document<\/span>.write(\"Very Good<br \/>\"<\/span>);\r\n               break<\/span>;\r\n            \r\n               case<\/span> 'C'<\/span>:<\/span> document<\/span>.write(\"Good<br \/>\"<\/span>);\r\n               break<\/span>;\r\n            \r\n               case<\/span> 'D'<\/span>:<\/span> document<\/span>.write(\"Fair<br \/>\"<\/span>);\r\n               break<\/span>;\r\n            \r\n               case<\/span> 'F'<\/span>:<\/span> document<\/span>.write(\"Fail<br \/>\"<\/span>);\r\n               break<\/span>;\r\n            \r\n               default<\/span>:<\/span>  document<\/span>.write(\"Invalid grade<br \/>\"<\/span>)\r\n            }\r\n         \/\/--><\/span>\r\n      <\/script><\/span>                  \r\n      \r\n      You can try different values for grade\r\n   <\/body><\/span>\r\n<\/html><\/span>\r\n<\/pre>\n
 <\/p>\n
If you view the code above, you will have the output:<\/p>\n
 <\/p>\n
Entering switch statement block\r\nVery Good\r\nYou can try different values for grade \r\n<\/pre>\n
 <\/p>\n
Now, assuming you did not use the break statements? Let’s try it to see what the output will be.<\/p>\n
The code without break statements is given below:<\/p>\n
 <\/p>\n
<html><\/span>\r\n<head><title><\/span>Switch Statement Example<\/title><\/head><\/span>\r\n   <body><\/span>\r\n   \r\n      <script <\/span>type =<\/span> \"text\/javascript\"<\/span>><\/span>\r\n         <!--<\/span>\r\n            var<\/span> grade =<\/span> 'B'<\/span>;\r\n            document<\/span>.write(\"Entering switch statement block<br \/>\"<\/span>);\r\n            switch<\/span> (grade) {\r\n               case<\/span> 'A'<\/span>:<\/span> document<\/span>.write(\"Excellent<br \/>\"<\/span>);\r\n            \r\n               case<\/span> 'B'<\/span>:<\/span> document<\/span>.write(\"Very Good<br \/>\"<\/span>);\r\n            \r\n               case<\/span> 'C'<\/span>:<\/span> document<\/span>.write(\"Good<br \/>\"<\/span>);\r\n            \r\n               case<\/span> 'D'<\/span>:<\/span> document<\/span>.write(\"Fair<br \/>\"<\/span>);\r\n            \r\n               case<\/span> 'F'<\/span>:<\/span> document<\/span>.write(\"Fail<br \/>\"<\/span>);\r\n            \r\n               default<\/span>:<\/span>  document<\/span>.write(\"Invalid grade<br \/>\"<\/span>)\r\n            }\r\n         \/\/--><\/span>\r\n      <\/script><\/span>                  \r\n      \r\n      You can try different values for grade\r\n   <\/body><\/span>\r\n<\/html><\/span>\r\n<\/pre>\n
 <\/p>\n
Now, if you view this page, you will see that it displays the result below. Clearly, this does not make any sense. Because we only have one grade.<\/p>\n
 <\/p>\n
Entering switch statement block\r\nVery Good\r\nGood\r\nFair\r\nFail\r\nInvalid grade\r\nYou can try different values for grade \r\n<\/pre>\n
 <\/p>\n
So don’t forget break statement.<\/p>\n","protected":false},"excerpt":{"rendered":"
Previously we discussed if-statement under Conditional Statements. Now, you could have several if-else-if statements. But this is not always the best solution. Hence, there is … <\/p>\n","protected":false},"author":395,"featured_media":42,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-40","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript-tutorials"],"yoast_head":"\nJavaScript - Switch Statement - JavaScript Tutorial<\/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:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript - Switch Statement - JavaScript Tutorial\" \/>\n<meta property=\"og:description\" content=\"Previously we discussed if-statement under Conditional Statements. Now, you could have several if-else-if statements. But this is not always the best solution. Hence, there is …\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/\" \/>\n<meta property=\"og:site_name\" content=\"JavaScript Tutorial\" \/>\n<meta property=\"article:published_time\" content=\"2019-03-28T15:53:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-08-06T06:02:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.kindsonthegenius.com\/javascript\/wp-content\/uploads\/sites\/6\/2019\/03\/JavaScript-Switch-Statement.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"792\" \/>\n\t<meta property=\"og:image:height\" content=\"421\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"kindsonthegenius\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"kindsonthegenius\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/\"},\"author\":{\"name\":\"kindsonthegenius\",\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/#\\\/schema\\\/person\\\/63a68934672db675ff0cd80d066510c2\"},\"headline\":\"JavaScript – Switch Statement\",\"datePublished\":\"2019-03-28T15:53:41+00:00\",\"dateModified\":\"2020-08-06T06:02:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/\"},\"wordCount\":282,\"commentCount\":2,\"image\":{\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/wp-content\\\/uploads\\\/sites\\\/6\\\/2019\\\/03\\\/JavaScript-Switch-Statement.jpg\",\"articleSection\":[\"JavaScript Tutorials\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/\",\"url\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/\",\"name\":\"JavaScript - Switch Statement - JavaScript Tutorial\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/wp-content\\\/uploads\\\/sites\\\/6\\\/2019\\\/03\\\/JavaScript-Switch-Statement.jpg\",\"datePublished\":\"2019-03-28T15:53:41+00:00\",\"dateModified\":\"2020-08-06T06:02:23+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/#\\\/schema\\\/person\\\/63a68934672db675ff0cd80d066510c2\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/wp-content\\\/uploads\\\/sites\\\/6\\\/2019\\\/03\\\/JavaScript-Switch-Statement.jpg\",\"contentUrl\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/wp-content\\\/uploads\\\/sites\\\/6\\\/2019\\\/03\\\/JavaScript-Switch-Statement.jpg\",\"width\":792,\"height\":421,\"caption\":\"JavaScript Switch Statement\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/07-javascript-switch-statement\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"JavaScript – Switch Statement\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/#website\",\"url\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/\",\"name\":\"JavaScript Tutorial\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/#\\\/schema\\\/person\\\/63a68934672db675ff0cd80d066510c2\",\"name\":\"kindsonthegenius\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/3079a7f663b02e801d03cd075852a037af36bd179b5fbcd0603bae3dd7833a9b?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/3079a7f663b02e801d03cd075852a037af36bd179b5fbcd0603bae3dd7833a9b?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/3079a7f663b02e801d03cd075852a037af36bd179b5fbcd0603bae3dd7833a9b?s=96&d=mm&r=g\",\"caption\":\"kindsonthegenius\"},\"url\":\"https:\\\/\\\/www.kindsonthegenius.com\\\/javascript\\\/author\\\/kindsonthegenius-2\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"JavaScript - Switch Statement - JavaScript Tutorial","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:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/","og_locale":"en_US","og_type":"article","og_title":"JavaScript - Switch Statement - JavaScript Tutorial","og_description":"Previously we discussed if-statement under Conditional Statements. Now, you could have several if-else-if statements. But this is not always the best solution. Hence, there is …","og_url":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/","og_site_name":"JavaScript Tutorial","article_published_time":"2019-03-28T15:53:41+00:00","article_modified_time":"2020-08-06T06:02:23+00:00","og_image":[{"width":792,"height":421,"url":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-content\/uploads\/sites\/6\/2019\/03\/JavaScript-Switch-Statement.jpg","type":"image\/jpeg"}],"author":"kindsonthegenius","twitter_card":"summary_large_image","twitter_misc":{"Written by":"kindsonthegenius","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/#article","isPartOf":{"@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/"},"author":{"name":"kindsonthegenius","@id":"https:\/\/www.kindsonthegenius.com\/javascript\/#\/schema\/person\/63a68934672db675ff0cd80d066510c2"},"headline":"JavaScript – Switch Statement","datePublished":"2019-03-28T15:53:41+00:00","dateModified":"2020-08-06T06:02:23+00:00","mainEntityOfPage":{"@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/"},"wordCount":282,"commentCount":2,"image":{"@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/#primaryimage"},"thumbnailUrl":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-content\/uploads\/sites\/6\/2019\/03\/JavaScript-Switch-Statement.jpg","articleSection":["JavaScript Tutorials"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/","url":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/","name":"JavaScript - Switch Statement - JavaScript Tutorial","isPartOf":{"@id":"https:\/\/www.kindsonthegenius.com\/javascript\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/#primaryimage"},"image":{"@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/#primaryimage"},"thumbnailUrl":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-content\/uploads\/sites\/6\/2019\/03\/JavaScript-Switch-Statement.jpg","datePublished":"2019-03-28T15:53:41+00:00","dateModified":"2020-08-06T06:02:23+00:00","author":{"@id":"https:\/\/www.kindsonthegenius.com\/javascript\/#\/schema\/person\/63a68934672db675ff0cd80d066510c2"},"breadcrumb":{"@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/#primaryimage","url":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-content\/uploads\/sites\/6\/2019\/03\/JavaScript-Switch-Statement.jpg","contentUrl":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-content\/uploads\/sites\/6\/2019\/03\/JavaScript-Switch-Statement.jpg","width":792,"height":421,"caption":"JavaScript Switch Statement"},{"@type":"BreadcrumbList","@id":"https:\/\/www.kindsonthegenius.com\/javascript\/07-javascript-switch-statement\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.kindsonthegenius.com\/javascript\/"},{"@type":"ListItem","position":2,"name":"JavaScript – Switch Statement"}]},{"@type":"WebSite","@id":"https:\/\/www.kindsonthegenius.com\/javascript\/#website","url":"https:\/\/www.kindsonthegenius.com\/javascript\/","name":"JavaScript Tutorial","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.kindsonthegenius.com\/javascript\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.kindsonthegenius.com\/javascript\/#\/schema\/person\/63a68934672db675ff0cd80d066510c2","name":"kindsonthegenius","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/3079a7f663b02e801d03cd075852a037af36bd179b5fbcd0603bae3dd7833a9b?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/3079a7f663b02e801d03cd075852a037af36bd179b5fbcd0603bae3dd7833a9b?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/3079a7f663b02e801d03cd075852a037af36bd179b5fbcd0603bae3dd7833a9b?s=96&d=mm&r=g","caption":"kindsonthegenius"},"url":"https:\/\/www.kindsonthegenius.com\/javascript\/author\/kindsonthegenius-2\/"}]}},"_links":{"self":[{"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/posts\/40","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/users\/395"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/comments?post=40"}],"version-history":[{"count":2,"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/posts\/40\/revisions"}],"predecessor-version":[{"id":111,"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/posts\/40\/revisions\/111"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/media\/42"}],"wp:attachment":[{"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/media?parent=40"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/categories?post=40"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kindsonthegenius.com\/javascript\/wp-json\/wp\/v2\/tags?post=40"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}