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Module:Number

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--
-- Number manipulation methods
--
-- Many methods are already available in the math library, so this will be fairly small
--
 
local p = {}
 
--
-- Rounds a number to a specified number of decimal places
--
-- If dp is not specified, it defaults to zero
-- based on <http://dev.wikia.com/wiki/Module:HF>
--
function p._round( num, dp )
    if not num then
        return
    end
    local mult = 10 ^ ( dp or 0 )
    return math.floor( num * mult + 0.5 ) / mult
end
 
function p.round( frame )
    return p._round( frame.args[1], frame.args[2] )
end
 
--
-- Expands a shorthand number to an actual number
--
-- @example 3.5k -> 3500
-- @example 10m -> 10000000
--
-- Returns the string if it is not a valid number
--
 
function p._short( str )
    local num = str:sub( 1, -2 )
    local char = str:sub( -1 )
    if tonumber( num ) then
        if char == 'k' then
            num = num * 10^3
        elseif char == 'm' then
            num = num * 10^6
        elseif char == 'b' then
            -- strip trailing letter
            num = num * 10^9
        else
            return str
        end
        return num
    else
        return str
    end
end
 
function p.short( frame )
    return p._short( frame.args[1] )
end
 
return p

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