{"id":69,"date":"2015-04-01T10:13:16","date_gmt":"2015-04-01T10:13:16","guid":{"rendered":"http:\/\/www.mbarsinai.com\/blog\/?p=69"},"modified":"2015-04-01T10:13:16","modified_gmt":"2015-04-01T10:13:16","slug":"print-a-filled-rectangle-in-scala","status":"publish","type":"post","link":"https:\/\/www.mbarsinai.com\/blog\/2015\/04\/01\/print-a-filled-rectangle-in-scala\/","title":{"rendered":"Print a filled rectangle in Scala"},"content":{"rendered":"<p><a href=\"http:\/\/stackoverflow.com\/users\/4695368\/puppies\" target=\"_blank\">@puppies <\/a>, over at StackOverflow, had a question about <a href=\"http:\/\/stackoverflow.com\/questions\/29375837\/how-to-print-a-filled-rectangle-in-scala\/29377976#29377976\" target=\"_blank\">how to print a filled rectangle in Scala<\/a>. I guess s\/he has an imperative background, because a) we all do, and b) s\/he made an attempt to do this using loops. But in Scala, you can also do this with mapping and list concatenation.<\/p>\n<p>Here&#8217;s my initial take (all code is printed on the scala REPL):<\/p>\n<p><code><br \/>\nval ec=\"@\"<br \/>\nval cc=\"X\"<br \/>\nval cols=8<br \/>\nval rows=5<\/p>\n<p>((ec*(cols+2)) +: Range(0,rows).map( _ => ec+cc*cols+ec) :+ (ec*(cols+2)) ).foreach( println(_) )<\/p>\n<p><\/code><\/p>\n<p>Which results in<br \/>\n<code><br \/>\n@@@@@@@@@@<br \/>\n@XXXXXXXX@<br \/>\n@XXXXXXXX@<br \/>\n@XXXXXXXX@<br \/>\n@XXXXXXXX@<br \/>\n@XXXXXXXX@<br \/>\n@@@@@@@@@@<br \/>\n<\/code><\/p>\n<p>So then, <a href=\"http:\/\/stackoverflow.com\/users\/1223622\/ben-reich\" target=\"_blank\">Ben Reich<\/a> suggested using <code>until<\/code> in stead of <code>Range<\/code>. Also, we can replace the side-effect in <code>foreach<\/code> with <code>mkString<\/code>:<\/p>\n<p><code><br \/>\n((ec*(cols+2)) +: (0 until rows).map( _ => ec+cc*cols+ec) :+ (ec*(cols+2)) ).mkString(\"\\n\")<br \/>\n<\/code><\/p>\n<p>Can you print this rectangle using a shorter snippet? Post your version in the comments.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>@puppies , over at StackOverflow, had a question about how to print a filled rectangle in Scala. I guess s\/he has an imperative background, because a) we all do, and b) s\/he made an attempt to do this using loops. But in Scala, you can also do this with mapping and list concatenation. Here&#8217;s my [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[3,2],"tags":[],"class_list":["post-69","post","type-post","status-publish","format-standard","hentry","category-programming","category-scala"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p3NnQg-17","_links":{"self":[{"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/posts\/69","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/comments?post=69"}],"version-history":[{"count":2,"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/posts\/69\/revisions"}],"predecessor-version":[{"id":71,"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/posts\/69\/revisions\/71"}],"wp:attachment":[{"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/media?parent=69"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/categories?post=69"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mbarsinai.com\/blog\/wp-json\/wp\/v2\/tags?post=69"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}