{"id":8985,"date":"2019-04-29T10:31:54","date_gmt":"2019-04-29T13:31:54","guid":{"rendered":"http:\/\/blog.plataformatec.com.br\/?p=8985"},"modified":"2019-05-01T05:23:24","modified_gmt":"2019-05-01T08:23:24","slug":"whats-new-in-elixir-apr-19","status":"publish","type":"post","link":"https:\/\/blog.plataformatec.com.br\/2019\/04\/whats-new-in-elixir-apr-19\/","title":{"rendered":"What&#8217;s new in Elixir &#8211; Apr\/19"},"content":{"rendered":"<p>Hi everyone, we are back with another edition of What&#8217;s new in Elixir! Let&#8217;s get started.<\/p>\n<ul>\n<li><a href=\"https:\/\/github.com\/elixir-lang\/elixir\/pull\/8677\" target=\"_blank\" rel=\"noopener noreferrer\"><code>mix release<\/code> has been added!<\/a> Besides basic releases support, it supports runtime configuration, customization via templates files, custom steps, and more. A huge thank you to both <a href=\"https:\/\/github.com\/bitwalker\/distillery\" target=\"_blank\" rel=\"noopener noreferrer\">Distillery<\/a> and <a href=\"https:\/\/github.com\/erlware\/relx\" target=\"_blank\" rel=\"noopener noreferrer\">Relx<\/a> teams for the prior work that made releases in Elixir itself possible. <a href=\"https:\/\/hexdocs.pm\/mix\/master\/Mix.Tasks.Release.html\" target=\"_blank\" rel=\"noopener noreferrer\">See the docs<\/a> for a complete rundown on the available features. Give it a try!<\/li>\n<li><a href=\"https:\/\/github.com\/elixir-lang\/elixir\/pull\/8932\" target=\"_blank\" rel=\"noopener noreferrer\">Config changes in <code>mix new<\/code><\/a>: Configuration has been a recurring topic in the Elixir community and Elixir v1.9.0 aims to further guide the community towards best practices. The first change is that we will no longer generate <code>config\/config.exs<\/code> for projects generated with <code>mix new<\/code>. <a href=\"https:\/\/hexdocs.pm\/elixir\/master\/library-guidelines.html#avoid-application-configuration\" target=\"_blank\" rel=\"noopener noreferrer\">Relying on configuration is undesired for most libraries<\/a> and the generated <code>config<\/code> files pushed library authors in the wrong direction. Furthermore, <code>mix new --umbrella<\/code> will no longer generate a configuration for each child app, instead all configuration should be declared in the umbrella root. That&#8217;s how it has always behaved, we are now making it explicit.<\/li>\n<li><a href=\"https:\/\/github.com\/elixir-lang\/elixir\/pull\/8957\" target=\"_blank\" rel=\"noopener noreferrer\">A new <code>Config<\/code> module has been added to Elixir<\/a>. Since releases may have their own configuration and since we do not want releases to depend on Mix (which is a build tool), <code>use Mix.Config<\/code> has been soft-deprecated in favor of the new <code>import Config<\/code> which is part of Elixir itself.<\/li>\n<li>Logger is now more efficient to compute <a href=\"https:\/\/github.com\/elixir-lang\/elixir\/pull\/8567\" target=\"_blank\" rel=\"noopener noreferrer\">when messages have to be discarded<\/a>. Performance has also been generally improved for those <a href=\"https:\/\/github.com\/elixir-lang\/elixir\/pull\/8977\" target=\"_blank\" rel=\"noopener noreferrer\">running in recent Erlang\/OTP versions<\/a> (21.2+).<\/li>\n<li><a href=\"https:\/\/github.com\/elixir-lang\/elixir\/pull\/8824\" target=\"_blank\" rel=\"noopener noreferrer\">A <code>~U<\/code> sigil for UTC date times<\/a> has been added.<\/li>\n<li><a href=\"https:\/\/github.com\/elixir-lang\/elixir\/pull\/3798\" target=\"_blank\" rel=\"noopener noreferrer\"><code>System.get_env\/2<\/code>, <code>System.fetch_env\/1<\/code>, and <code>System.fetch_env!\/1<\/code> have been added<\/a> for those looking forward to simplify their config files.<\/li>\n<\/ul>\n<p>Plus many other enhancements and bug fixes. If you want to give those features a try, you can always <a href=\"https:\/\/elixir-lang.org\/install.html#compiling-from-source-unix-and-mingw\" target=\"_blank\" rel=\"noopener noreferrer\">compile Elixir from source<\/a>. If you are using version managers, such as <code>asdf<\/code>, they likely have built-in mechanisms to compile from master too.<\/p>\n<p>As usual, in the last weeks we have done extensive work on the issues tracker, bringing the number of open issues to below 10 and the number of pending PRs to below 5 (at the time of writing). We are always proud of how much work and care goes into the issues tracker, thanks everyone who contributed! For a complete listing of all changes, <a href=\"https:\/\/github.com\/elixir-lang\/elixir\/blob\/master\/CHANGELOG.md\" target=\"_blank\" rel=\"noopener noreferrer\">see the CHANGELOG<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hi everyone, we are back with another edition of What&#8217;s new in Elixir! Let&#8217;s get started. mix release has been added! Besides basic releases support, it supports runtime configuration, customization via templates files, custom steps, and more. A huge thank you to both Distillery and Relx teams for the prior work that made releases in &#8230; <a class=\"read-more-link\" href=\"https:\/\/blog.plataformatec.com.br\/2019\/04\/whats-new-in-elixir-apr-19\/\">\u00bb<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[143,298],"aioseo_notices":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/posts\/8985"}],"collection":[{"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/comments?post=8985"}],"version-history":[{"count":18,"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/posts\/8985\/revisions"}],"predecessor-version":[{"id":9020,"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/posts\/8985\/revisions\/9020"}],"wp:attachment":[{"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/media?parent=8985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/categories?post=8985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.plataformatec.com.br\/wp-json\/wp\/v2\/tags?post=8985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}