How do I capitalize the first letter of every word of a given string value?

Split it by space, grab the first letter of every word, upper it and then put everything back together.

local str = "a quick brown fox blabla"
local spl = string.split(str, " ") --split by space
for i,word in pairs(spl) do
    local firstLetter = word:sub(1,1) --get the 1st letter of the word
    local theRest = word:sub(2) --grt everything except the first letter
    spl[i] = firstLetter:upper() .. theRest
end

local result = table.concat(spl, " ") --put it back together
print(result)

A shorter version:

local str = "a quick brown fox blabla"
local spl = string.split(str, " ")
for i,v in pairs(spl) do
    spl[i] = v:sub(1,1):upper() .. v:sub(2)
end
local result = table.concat(spl, " ")