A very tiny thing that annoyed me in COBOL was that there was no dedicated modulo operation. Instead you could do a division specifying that you only wanted whole number results and store the rest in a different variable. Since COBOL is very sensitive when it comes to variables that means that you ended up with a variable you didn't really need, i.e. the actual result of the division. This is the story of how I once named a variable "USELESS" - that was the most appropriate name I could think of.

在JavaScript中，下面的构造

return
{
    id : 1234,
    title : 'Tony the Pony'
};

返回undefined是一个语法错误，因为在返回后的换行上偷偷地插入了分号。以下工作正如你所期望的那样:

return {
    id : 1234,
    title : 'Tony the Pony'
};

更糟糕的是，这个也可以(至少在Chrome中):

return /*
*/{
    id : 1234,
    title : 'Tony the Pony'
};

下面是同一个问题的一个变种，它不会产生语法错误，只是无声地失败了:

return
    2 + 2;

c++最恼人的解析:

struct S
{
    S() {} //default constructor
};

int main() {

    S s(); // this is not a default construction, it declares a function named s that takes no arguments and returns S.
}

在ColdFusion中，数组从1开始。

C + + 1 xλ的:

[] (int x) { std::cout << x << std::endl; } ();

它们可能被滥用在一些奇怪的语法中:

[](){}();[]{[]{}();}();

这是完全有效的c++ 1x。

Python for循环中的else。

来自Python文档:

for n in range(2, 10):
    for x in range(2, n):
        if n % x == 0:
            print n, 'equals', x, '*', n/x
            break
    else:
        # loop fell through without finding a factor
        print n, 'is a prime number'

输出:

2 is a prime number
3 is a prime number
4 equals 2 * 2
5 is a prime number
6 equals 2 * 3
7 is a prime number
8 equals 2 * 4
9 equals 3 * 3