{"id":2925,"date":"2012-03-23T09:18:01","date_gmt":"2012-03-23T13:18:01","guid":{"rendered":"http:\/\/teamtutorials.com\/?p=2925"},"modified":"2012-04-04T13:36:56","modified_gmt":"2012-04-04T17:36:56","slug":"simple-array-comparison-with-ruby","status":"publish","type":"post","link":"https:\/\/teamtutorials.com\/web-development-tutorials\/simple-array-comparison-with-ruby","title":{"rendered":"Simple Array Comparison with Ruby"},"content":{"rendered":"<p>I ran into a task where I needed to find the differences with some data. Since I&#8217;ve not spent much time with ruby I decided to give it a shot. It was surprisingly simple to do what I needed to do in ruby. I&#8217;m not going to post the entire details right now, but wanted to leave a quick note here on comparing arrays.<\/p>\n<p>I stored the data I needed to evaluate into an array. I wanted to find the items that appeared in array A but not in array B. Basically all we need to do is included the ruby set library and then it is very very simple to do this.<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">\r\nrequire 'set'\r\n\r\n#create array\r\na = [1,2,3,4]\r\nb = [2,3,5,6]\r\n\r\n#convert to set\r\na.to_set\r\nb.to_set\r\n\r\n#remove items in b from a\r\ndiff = (a - b)\r\n\r\n#output what ever is left\r\nputs diff\r\n<\/pre>\n<p>Since I already had my data in an array, I just converted it to a set object. Technically if you are creating a set you could use either of these methods:<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">\r\na = Set.new[1,2,3]\r\n#or\r\na = [1,2,3].to_set\r\n<\/pre>\n<p>Mainly I wanted to add this little snippet so I can refer back to this at some point, but I figured it may help someone else who is new to ruby. For more information on set check out the  <a href=\"http:\/\/www.ruby-doc.org\/stdlib-1.9.3\/libdoc\/set\/rdoc\/Set.html\" target=\"_blank\">set documentation<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I ran into a task where I needed to find the differences with some data. Since I&#8217;ve not spent much time with ruby I decided to give it a shot. It was surprisingly simple to do what I needed to do in ruby. I&#8217;m not going to post the entire details right now, but wanted &#8230; <a title=\"Simple Array Comparison with Ruby\" class=\"read-more\" href=\"https:\/\/teamtutorials.com\/web-development-tutorials\/simple-array-comparison-with-ruby\" aria-label=\"More on Simple Array Comparison with Ruby\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":2929,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[156,17],"tags":[153,155,152,154],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Simple Array Comparison with Ruby<\/title>\n<meta name=\"description\" content=\"I ran into a task where I needed to find the differences with some data. Since I&#039;ve not spent much time with ruby I decided to give it a shot. 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