{"id":6694,"date":"2022-08-08T12:35:06","date_gmt":"2022-08-08T12:35:06","guid":{"rendered":"https:\/\/www.garysieling.com\/blog\/?p=6694"},"modified":"2022-08-08T12:35:06","modified_gmt":"2022-08-08T12:35:06","slug":"r-quote-vs-expr","status":"publish","type":"post","link":"https:\/\/www.garysieling.com\/blog\/r-quote-vs-expr\/","title":{"rendered":"R: quote vs expr"},"content":{"rendered":"\n<p><strong>quote<\/strong>: returns it&#8217;s argument (an expression) as is; variables would be filled in later<\/p>\n\n\n\n<p><strong>substitute<\/strong>: the same, <em>except<\/em>, variables from the environment are referenced<\/p>\n\n\n\n<p><strong>expr<\/strong>: superficially, the documentation makes it sounds the same as quote. However, a major difference &#8211; you can build larger arguments. To prevent evaluation of calls, put in !! operator:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>> eval(quote(toupper(quote(letters))))\n&#91;1] \"LETTERS\"\n\n> eval(quote(toupper(!!quote(letters))))\nError in !quote(letters) : invalid argument type\n\n> eval(expr(toupper(!!quote(letters))))\n&#91;1] \"A\" \"B\" \"C\" \"D\" \"E\" \"F\" \"G\" \"H\" \"I\" \"J\" \"K\" \"L\" \"M\" \"N\" \"O\" \"P\" \"Q\" \"R\" \"S\" \"T\" \"U\" \"V\" \"W\" \"X\" \"Y\" \"Z\"<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>quote: returns it&#8217;s argument (an expression) as is; variables would be filled in later substitute: the same, except, variables from the environment are referenced expr: superficially, the documentation makes it sounds the same as quote. However, a major difference &#8211; you can build larger arguments. To prevent evaluation of calls, put in !! operator:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[6],"tags":[450],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"quote: returns it&#039;s argument (an expression) as is; variables would be filled in later substitute: the same, except, variables from the environment are referenced expr: superficially, the documentation makes it sounds the same as quote. However, a major difference - you can build larger arguments. To prevent evaluation of calls, put in !! operator: &gt;\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"gary\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.garysieling.com\/blog\/r-quote-vs-expr\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.9\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Gary Sieling - Software Engineer\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"R: quote vs expr - Gary Sieling\" \/>\n\t\t<meta property=\"og:description\" content=\"quote: returns it&#039;s argument (an expression) as is; variables would be filled in later substitute: the same, except, variables from the environment are referenced expr: superficially, the documentation makes it sounds the same as quote. However, a major difference - you can build larger arguments. 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