Module:Sandbox/Gnsjhenjie Explained

--gnsJhenJie Google Code-in 2019, Introduction to Lua in Wikipedialocal p = -- p stands for package

function p.hello(frame) return "Hello, world!"end

p.Hi = function(frame) strName = frame.args.name or "Jimbo" return "Hello from Lua to my friend " .. strName .. ".
"end

p.temperature = function(frame) cel = tonumber(frame.args.celsius) or 0 if cel >9 then msg = "It is warm." else msg = "It is cold." end fah = cel*9/5+32 msg = msg .. " " .. cel .. " degrees Celsius is " .. fah .. " degrees Fahrenheit.
" return msg end -- Task 4p.times = function(frame) local num = tonumber(frame.args.num) or 2 local out = num .. " times table
" for i = 1, 12 do out = out .. num .. " times " .. i .. " equals " .. i * num .. "
" end return outend

p.mum = function(frame) local family = local msg = "" for i = 1, #family do msg = msg .. "Hello " .. family[i] .. "
" end return msgend

p.sentence = function(frame) local str = frame.args.words or "" local out = string.upper(string.sub(str,1,1)) .. string.sub(str, 2) return outend

p.unpackdate = function(frame) local dmydate = frame.args.dmydate or "" local day, month, year = string.match(dmydate, "(%d+) (%w+) (%d+)") return "Year = " .. year .. "
Day = " .. day .. "
Month = " .. monthend

p.langnames = function(frame) local langlist = mw.language.fetchLanguageNames local langs = "" local count = 0 for k, v in pairs(langlist) do langs = langs .. k .. " - " .. v .. "
" count = count + 1 end return langs .. "
= " .. count .. " languages"end

p.fallbacks = function(frame) local langcode = frame.args.langcode local langlist = mw.language.getFallbacksFor(langcode) local langs = "" for k, v in pairs(langlist) do langs = langs .. k .. " - " .. v .. "
" end return langs end p.pagename = function(frame) local ttl = frame.args.title local ttlobj = mw.title.new(ttl) local txt = ttlobj.text return txtend

p.pageinfo = function(frame) local ttl = frame.args.title local ttlobj = mw.title.new(ttl) local exist = false local redirect = false if ttlobj.exists

true then exist = true end if ttlobj.isRedirect

true then redirect = true end if exist then if redirect

true then return ttl .. " exists and is a redirect
" else return ttl .. " exists and is not a redirect
" end else return ttl .. " does not exist and is not a redirect
" endend

return p