檢查是否所有的陳述都是錯誤的？

Question

只有多個語句爲false時，纔有辦法執行一行代碼？

我有一個清單：

inventory = { 
    {"Images/Category 1/pistol1.png", false}, 
    {"Images/Category 1/machinePistol1.png", false}, 
    {"Images/Category 2/shotgun1.png", false}, 
    {"Images/Category 2/assaultRifle1.png", false}, 
    {"Images/Category 3/sniperRifle1.png", false}, 
    {"Images/Category 3/rocketLauncher1.png", false} 
} 

而且我想編寫一個執行一行代碼的函數，如果所有這些語句都是假的，但顯然執行別的東西，如果他們中的一個，即使是真實的。

Answer 1

您可以使用一個變量，並假設這是真的。如果你想讓它與多個 falses執行

local IsEverythingTrue = true 

-- the **for** statement is a loop. It will allow us to operate 
-- the same way on any number elements in inventory. 
-- _,v stands for variables that we are going to read from inventory table 
-- we can't do it directly, however; **ipairs** function will prepare it so 
-- _ will hold numerical index of each element (1, 2, 3 and so on); 
-- we don't use it, though, so I put in a placeholder name 
-- v will hold every value, so your two-element table 

for _,v in ipairs(inventory) do 

    -- if any value of v[2] is false, break 
    -- v[2] is equal to inventory[_][2] 
    -- if not v[2] can be written as 
    -- *if value of v[2] isn't true* 

    if not v[2] then 
     -- in this case, after first non-true element has been found 
     -- we know that not every one is true, or there is at least one false 
     IsEverythingTrue = false 
     break -- we don't have to check anything else 
    end 
end 

然後使用該變量表達

if IsEverythingTrue then 
    -- do something 
else 
    -- do something else 
end 

，只是指望他們。在開始時添加local falseCount = 0，並將break更改爲falseCount = falseCount + 1。