Module:Capitalize words

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This module capitalizes the first letter of each word in an input string, assuming the words are delimited by whitespace.

Usage: {{#invoke:Capitalize words|capitalize|<input string>}}.

local p = {}

-- Capitalize the first letter of each word in a string
-- Words are separated by spaces
function p.capitalize(frame)
    local str = frame.args[1] or ""
    
    -- Handle empty string
    if str == "" then
        return ""
    end
    
    -- Capitalize first letter of each word
    local result = str:gsub("(%a)([%w_']*)", function(first, rest)
        return first:upper() .. rest:lower()
    end)
    
    return result
end

return p