{"id":13251,"date":"2021-12-02T02:34:45","date_gmt":"2021-12-02T07:34:45","guid":{"rendered":"https:\/\/rud.is\/b\/?p=13251"},"modified":"2021-12-02T02:34:45","modified_gmt":"2021-12-02T07:34:45","slug":"2021-advent-of-code-day-02-dont-try-this-at-home-edition","status":"publish","type":"post","link":"https:\/\/rud.is\/b\/2021\/12\/02\/2021-advent-of-code-day-02-dont-try-this-at-home-edition\/","title":{"rendered":"2021 Advent of Code Day 02 “Don’t Try This At Home” Edition"},"content":{"rendered":"

The Moderna booster level drained me all day on Dec 1 and did what jab two did during the overnight period (achy enough to wake me up and not get back to slumber easily). To try to wear myself down, I decided to practice a bit of R with the 2021 Advent of Code<\/a>. There are plenty of superb R bloggers chronicling their daily katas that I do not feel compelled to post every one (truth be told, work and fam tasks\/priorities will make devoting any time to this year’s daily puzzles a rare event).<\/p>\n

Day 01<\/a> was very straightforward (even part 2 which I used {RcppRoll} despite hoping to stick to only base R 4.x) so it’s kinda not worth a post (for me), but Day 02<\/a> was kinda fun as I don’t have regular opportunities to use scan()<\/code> and get()<\/code>.<\/p>\n

The input is a series of submarine commands:<\/p>\n

forward 5\ndown 5\nforward 8\nup 3\ndown 8\nforward 2\n<\/code><\/pre>\n
with a set of rules that change between parts 1 and 2.<\/p>\n
We can read in those commands with scan()<\/code> which lets us specify a pattern for each line (scan()<\/code> takes care of dealing with whitespace for you):<\/p>\n
scan(\n  text = \"forward 5\ndown 5\nforward 8\nup 3\ndown 8\nforward 2\",\nwhat = list(character(0), integer(0))\n) |>\n  setNames(c(\"command\", \"value\")) -> input\n\nstr(input)\n## List of 2\n##  $ command: chr [1:6] \"forward\" \"down\" \"forward\" \"up\" ...\n##  $ value  : int [1:6] 5 5 8 3 8 2\n<\/code><\/pre>\n
The rules (link above) were pretty basic, increment\/decrement some variables based on the command input, but I wanted to avoid a bunch of if<\/code> statements.  Since R has the get()<\/code> function that enables searching by name for an object, we can make a series of functions that have the command as the identifier and then use get()<\/code> to call the function:<\/p>\n
up <- \\(x) depth <<- depth - x\ndown <- \\(x) depth <<- depth + x\nforward <- \\(x) position <<- position + x\n\nposition <- depth <- 0\n\nfor (idx in seq_along(input$command)) {\n  get(input$command[idx], mode = \"function\")(input$value[idx])\n}\n<\/code><\/pre>\n
(the final answer is computed by position<\/code> X depth<\/code>).<\/p>\n
While I find this to be a “fun” solution, I’d strongly suggest:<\/p>\n
    \n
  • avoiding using the new shortcut function declaration in mixed R version shops as it’s very new and likely to be confusing to new R users<\/li>\n
  • being wary of the <<-<\/code> assignment operator as it’s introducing a side-effect (parent\/global environment modification) which will come back to bite you in other projects some day<\/li>\n
  • ditching the $<\/code> referencing in favour of [[]]<\/code> \/ []<\/code> to avoid partial name matching “gotchas”, and<\/li>\n
  • adding explicit documentation to what you’re doing with get()<\/code> calls (provided you really have a good case for using get()<\/code> to begin with)<\/li>\n<\/ul>\n
    The code only changes slightly for part 2, so I’ll refrain from adding even more unreadable code from this post.<\/p>\n","protected":false},"excerpt":{"rendered":"
    The Moderna booster level drained me all day on Dec 1 and did what jab two did during the overnight period (achy enough to wake me up and not get back to slumber easily). To try to wear myself down, I decided to practice a bit of R with the 2021 Advent of Code. There […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_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":3,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[849,91],"tags":[],"class_list":["post-13251","post","type-post","status-publish","format-standard","hentry","category-advent-of-code","category-r"],"yoast_head":"\n2021 Advent of Code Day 02 "Don't Try This At Home" Edition - rud.is<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rud.is\/b\/2021\/12\/02\/2021-advent-of-code-day-02-dont-try-this-at-home-edition\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2021 Advent of Code Day 02 "Don't Try This At Home" Edition - rud.is\" \/>\n<meta property=\"og:description\" content=\"The Moderna booster level drained me all day on Dec 1 and did what jab two did during the overnight period (achy enough to wake me up and not get back to slumber easily). 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They house photo galleries, interactive visualizations, web fonts, analytics code and other diverse types of content. Despite the potential for diversity, many web sites share similar \"tech stacks\" --- the components that come together to make them what they are. These stacks consist of web\u2026","rel":"","context":"In "R"","block_context":{"text":"R","link":"https:\/\/rud.is\/b\/category\/r\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2017\/09\/Viewer_Zoom.png?fit=1198%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2017\/09\/Viewer_Zoom.png?fit=1198%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2017\/09\/Viewer_Zoom.png?fit=1198%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2017\/09\/Viewer_Zoom.png?fit=1198%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2017\/09\/Viewer_Zoom.png?fit=1198%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":12917,"url":"https:\/\/rud.is\/b\/2021\/01\/26\/making-it-easier-to-experiment-with-compiled-swift-code-in-r\/","url_meta":{"origin":13251,"position":5},"title":"Making It Easier To Experiment With Compiled Swift Code In R","author":"hrbrmstr","date":"2021-01-26","format":false,"excerpt":"The past two posts have (lightly) introduced how to use compiled Swift code in R, but they've involved a bunch of \"scary\" command line machinations and incantations. One feature of {Rcpp} I've always ? is the cppFunction() (\"r-lib\" zealots have a similar cpp11::cpp_function()) which lets one experiment with C[++] code\u2026","rel":"","context":"In "macOS"","block_context":{"text":"macOS","link":"https:\/\/rud.is\/b\/category\/macos\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/posts\/13251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/comments?post=13251"}],"version-history":[{"count":0,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/posts\/13251\/revisions"}],"wp:attachment":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/media?parent=13251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/categories?post=13251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/tags?post=13251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}