Dot, colon and self

- Point ID definition and point ID call: a bit similar to the access method of data index

girl = {money = 200}

function girl.goToMarket(girl ,someMoney)

    girl.money = girl.money --someMoney

end

girl.goToMarket(girl ,100)

print(girl.money)

 

- Parameter self points to the caller itself (similar to this in c++ points to the current class)
girl = {money = 200}

--This function is declared as a local type and will report an error

function girl.goToMarket (self, someMoney)
    self.money = self.money - someMoney
end

girl.goToMarket(girl, 100)
print(girl.money)

 

- Colon definition and colon call:
girl = {money = 200}

function girl: goToMarket (someMoney)
    self.money = self.money - someMoney
end

girl: goToMarket (100)
print (girl.money)

 

Reference materials:

https://www.w3cschool.cn/lua/o23m1te6.html