[LUA]How can I check if a arg is entered?

[Snagg]

script_description(".")


function main()
while not isSampAvailable() do wait(100) end
sampRegisterChatCommand('ii', health)
sampRegisterChatCommand('iz', armor)

wait(-1)
end


function health(health)
if not isPlayerDead(PLAYER_PED) then
    if health then
setCharHealth(PLAYER_PED, health)
else
    sampAddChatMessage("Add value!", -1)
end
else
    printf("You are dead!", 1500)
end
end

function armor(armor)
    if not isPlayerDead(PLAYER_PED) then
     if armor then
     addArmourToChar(PLAYER_PED, armor)
else
    sampAddChatMessage("Add value!", -1)
end
else
      printf("You are dead!", 1500)
    end
end

Firstly sorry for spamming this section with useless questions but I can't get how can I check if arg is valid. I tried many many things. Although I am familliar with coding, I seem to have a problem with lua. 😂

 

[ufdhbi]

script_description(".")


function main()
while not isSampAvailable() do wait(100) end
sampRegisterChatCommand('ii', health)
sampRegisterChatCommand('iz', armor)

wait(-1)
end


function health(health)
if not isPlayerDead(PLAYER_PED) then
    if health then
setCharHealth(PLAYER_PED, health)
else
    sampAddChatMessage("Add value!", -1)
end
else
    printf("You are dead!", 1500)
end
end

function armor(armor)
    if not isPlayerDead(PLAYER_PED) then
     if armor then
     addArmourToChar(PLAYER_PED, armor)
else
    sampAddChatMessage("Add value!", -1)
end
else
      printf("You are dead!", 1500)
    end
end

Firstly sorry for spamming this section with useless questions but I can't get how can I check if arg is valid. I tried many many things. Although I am familliar with coding, I seem to have a problem with lua. 😂

tonumber(health) , and armour