在你看来,你遇到过的最令人惊讶、最怪异、最奇怪或最“WTF”的语言特性是什么?
请每个回答只回答一个特征。
在你看来,你遇到过的最令人惊讶、最怪异、最奇怪或最“WTF”的语言特性是什么?
请每个回答只回答一个特征。
当前回答
在MAXScript中,所有操作符都是平等对待的。因此,a = b +c使a等于b,然后计算a+c的和,并丢弃结果。
其他回答
Python的三元操作符
在Python中,C三元操作符(c++示例:bool isNegative = i < 0 ?True: false;)可用作语法糖:
>>> i = 1
>>> "It is positive" if i >= 0 else "It is negative!"
'It is positive'
>>> i = -1
>>> "It is positive" if i >= 0 else "It is negative!"
'It is negative!'
这并不奇怪,而是一种特征。奇怪的是,与C中的顺序(条件?答:b)。
在Perl中,你可以做到:
my $test = "Hello World";
substr($test, 0, 5) = "Goodbye";
print $test;
这在其他语言中可行吗?
我很惊讶居然没有人提到Visual Basic的7个循环结构。
For i As Integer = 1 to 10 ... Next
While True ... End While
Do While True ... Loop
Do Until True ... Loop
Do ... Loop While True
Do ... Loop Until True
While True ... Wend
因为粘!你面前的条件实在是太复杂了!
在Javascript中,我认为以下是等价的:
a['title'] = "Syntactic sugar is good for yr teeth.";
a.title = "Syntactic sugar is good for yr teeth.";
Haskell's use of Maybe and Just. Maybe a is a type constructor that returns a type of Just a, but Maybe Int won't accept just an Int, it requires it to be a Just Int or Nothing. So in essence in haskell parlance Just Int is about as much of an Int as an apple is an orange. The only connection is that Just 5 returns a type of Maybe Interger, which can be constructed with the function Just and an Integer argument. This makes sense but is about as hard to explain as it can theoretically be, which is the purpose of haskell right? So is Just really JustKindaLikeButNotAtAll yea sorta, and is Maybe really a KindaLooksLikeOrIsNothing, yea sorta again.
-- Create a function that returns a Maybe Int, and return a 5, which know is definitly Int'able
> let x :: Maybe Int; x = 5;
<interactive>:1:24:
No instance for (Num (Maybe Int))
arising from the literal `5' at <interactive>:1:24
Possible fix: add an instance declaration for (Num (Maybe Int))
In the expression: 5
In the definition of `x': x = 5
> Just 5
Just 5
it :: Maybe Integer
-- Create a function x which takes an Int
> let x :: Int -> Int; x _ = 0;
x :: Int -> Int
-- Try to give it a Just Int
> x $ Just 5
<interactive>:1:4:
Couldn't match expected type `Int' against inferred type `Maybe t'
In the second argument of `($)', namely `Just 5'
In the expression: x $ Just 5
In the definition of `it': it = x $ Just 5
祝你好运读到这篇文章,我希望它是正确的。