# RogerBW's Blog

 The Weekly Challenge 207: Indexed Keyboards 12 March 2023 I’ve been doing the Weekly Challenges. The latest involved letter sorting and an array calculation. (Note that this closes today.) Task 1: Keyboard Word You are given an array of words. Write a script to print all the words in the given array that can be types using alphabet on only one row of the keyboard. Perl: ``````sub keyboardword(\$wl) { return [grep /^([qwertyuiop]+|[asdfghjkl]+|[zxcvbnm]+)\$/i, @{\$wl}]; } `````` Languages with less-embedded regexps are a little more faff, such as JavaScript: ``````function keyboardword(wl) { let re = /^([qwertyuiop]+|[asdfghjkl]+|[zxcvbnm]+)\$/i; let out = [] for (let w of wl) { if (w.search(re) > -1) { out.push(w); } } return out; } `````` Lua has regex-like patterns but without alternation, so I just check each one separately. PostScript doesn't have a pattern engine at all, so I build a dict with a row number for each letter, build another dict with all the row numbers I find, and pass on the word if there's just one row. Task 2: H-Index You are given an array of integers containing citations a researcher has received for each paper. Write a script to compute the researcher’s H-Index. For more information please checkout the wikipedia page. One of the few occasions on which a 1-based index is actually useful. Lua: ``````function h_index(c0) local c = c0 table.sort(c, function(a, b) return b < a end) local h = 0 for i, x in ipairs(c) do if i <= x then h = i else break end end return h end `````` And in PostScript, made much easier by library functions: ``````/h_index { 2 dict begin 0 exch quicksort reverse enumerate.array { aload pop /x exch def 1 add /i1 exch def i1 x le { pop i1 } { exit } ifelse } forall } bind def `````` Full code on github. Comments on this post are now closed. If you have particular grounds for adding a late comment, comment on a more recent post quoting the URL of this one. Search 10 per page 20 per page 50 per page 100 per page Archive Tags 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 3d printing action advent of code aeronautics aikakirja anecdote animation anime army astronomy audio audio tech aviation base commerce battletech beer boardgaming book of the week bookmonth chain of command children chris chronicle church of no redeeming virtues cold war comedy computing contemporary cornish smuggler cosmic encounter coup covid-19 crime cthulhu eternal cycling dead of winter doctor who documentary drama driving drone ecchi economics en garde espionage essen 2015 essen 2016 essen 2017 essen 2018 essen 2019 essen 2022 essen 2023 existential risk falklands war fandom fanfic fantasy feminism film firefly first world war flash point flight simulation food garmin drive gazebo genesys geocaching geodata gin gkp gurps gurps 101 gus harpoon historical history horror hugo 2014 hugo 2015 hugo 2016 hugo 2017 hugo 2018 hugo 2019 hugo 2020 hugo 2022 hugo-nebula reread in brief avoid instrumented life javascript julian simpson julie enfield kickstarter kotlin learn to play leaving earth linux liquor lovecraftiana lua mecha men with beards mpd museum music mystery naval noir non-fiction one for the brow opera parody paul temple perl perl weekly challenge photography podcast politics postscript powers prediction privacy project woolsack pyracantha python quantum rail raku ranting raspberry pi reading reading boardgames social real life restaurant reviews romance rpg a day rpgs ruby rust scala science fiction scythe second world war security shipwreck simutrans smartphone south atlantic war squaddies stationery steampunk stuarts suburbia superheroes suspense television the resistance the weekly challenge thirsty meeples thriller tin soldier torg toys trailers travel type 26 type 31 type 45 vietnam war war wargaming weather wives and sweethearts writing about writing x-wing young adult Special All book reviews, All film reviews
Produced by aikakirja v0.1