{"id":345,"date":"2023-01-19T05:00:00","date_gmt":"2023-01-19T13:00:00","guid":{"rendered":"https:\/\/www.angulartraining.com\/daily-newsletter\/?p=345"},"modified":"2023-01-18T17:10:34","modified_gmt":"2023-01-19T01:10:34","slug":"rxjs-tap-operator","status":"publish","type":"post","link":"https:\/\/www.angulartraining.com\/daily-newsletter\/rxjs-tap-operator\/","title":{"rendered":"RxJs tap operator"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The <code>tap<\/code> operator is one of the simplest <code>RxJs<\/code> operators because it doesn&#8217;t change anything to the data coming into your observable: <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"382\" src=\"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-content\/uploads\/2023\/01\/image-4-1024x382.png\" alt=\"\" class=\"wp-image-346\" srcset=\"https:\/\/www.angulartraining.com\/daily-newsletter\/wp-content\/uploads\/2023\/01\/image-4-1024x382.png 1024w, https:\/\/www.angulartraining.com\/daily-newsletter\/wp-content\/uploads\/2023\/01\/image-4-300x112.png 300w, https:\/\/www.angulartraining.com\/daily-newsletter\/wp-content\/uploads\/2023\/01\/image-4-768x286.png 768w, https:\/\/www.angulartraining.com\/daily-newsletter\/wp-content\/uploads\/2023\/01\/image-4.png 1178w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Why would we need a function that doesn&#8217;t do anything? We saw a first very <a href=\"https:\/\/www.angulartraining.com\/daily-newsletter\/async-pipe-syntax-tricks\/\" target=\"_blank\" rel=\"noopener\" title=\"\">important example that enabled us to use the <code>async<\/code> pipe<\/a> earlier.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At least three important use cases are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Debugging <\/strong>complex <code>RxJs<\/code> scenarios using <code>console.log<\/code> (as illustrated in the above marble diagram)<\/li>\n\n\n\n<li>Registering <strong>side effects<\/strong> as the data changes (that&#8217;s what we did in our async pipe scenario)<\/li>\n\n\n\n<li><strong>Watching<\/strong> for completion of inner observables (when you&#8217;re combining several observables into one subscription)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In short, <code>tap<\/code> is a way to <strong>spy on <\/strong>what is happening inside an observable stream. Any time you want to extract some data\/debug\/take a look at what&#8217;s going through an Observable, <code>tap<\/code> is the easiest answer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You can find examples for these three scenarios in my tutorial: <a href=\"https:\/\/blog.angulartraining.com\/three-reasons-to-use-the-tap-operator-from-rxjs-6828fcf288ec\" target=\"_blank\" rel=\"noopener\" title=\"\">3 reasons to use the <code>tap<\/code> operator<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The tap operator is one of the simplest RxJs operators because it doesn&#8217;t change anything to the data coming into your observable: Why would we need a function that doesn&#8217;t do anything? We saw a first very important example that enabled us to use the async pipe earlier. At least three important use cases are: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,10],"tags":[],"class_list":["post-345","post","type-post","status-publish","format-standard","hentry","category-operators","category-rxjs"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The tap operator is one of the simplest RxJs operators because it doesn&#039;t change anything to the data coming into your observable: Why would we need a function that doesn&#039;t do anything? We saw a first very important example that enabled us to use the async pipe earlier. At least three important use cases are:\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Alain Chautard\"\/>\n\t<meta name=\"google-site-verification\" content=\"SXxD3jwe28P5x4KWwWlYlHobuesNDkT6VWG1oVG1GcQ\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.angulartraining.com\/daily-newsletter\/rxjs-tap-operator\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.angulartraining.com\\\/daily-newsletter\\\/rxjs-tap-operator\\\/#article\",\"name\":\"RxJs tap operator | Angular Newsletter\",\"headline\":\"RxJs tap 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