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How to do associative array/hashing in JavaScript
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@Leo console.log({A:'B',C:'D'}[foo]) should give you A B.
– ychaouche
Jan 20 '19 at 14:07
2
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Writing a compiler in its own language
Intuitively, it would seems that a compiler for language Foo cannot itself be written in Foo. More specifically, the first compiler for language Foo cannot be written in Foo, but any subsequent compiler could be written for Foo .
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Stash only one file out of multiple files that have changed with Git?
...ff:
test_expect_success 'stash with multiple pathspec arguments' '
>foo &&
>bar &&
>extra &&
git add foo bar extra &&
git stash push -- foo bar &&
test_path_is_missing bar &&
test_path_is_missing foo &&...
throwing exceptions out of a destructor
...tructor. The output is performed by the guard object's
destructor unless foo() throws (in which case the number of uncaught
exceptions in the destructor is greater than what the constructor
observed)
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C# code to validate email address
...ValidateSomeEmails
{
static void Main(string[] args)
{
var foo = new EmailAddressAttribute();
bool bar;
bar = foo.IsValid("someone@somewhere.com"); //true
bar = foo.IsValid("someone@somewhere.co.uk"); //true
bar = foo.IsValid("someone+tag...
Unmarshaling nested JSON objects
...halJSON func.
https://play.golang.org/p/dqn5UdqFfJt
type A struct {
FooBar string // takes foo.bar
FooBaz string // takes foo.baz
More string
}
func (a *A) UnmarshalJSON(b []byte) error {
var f interface{}
json.Unmarshal(b, &f)
m := f.(map[string]interface{})
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Can I call an overloaded constructor from another constructor of the same class in C#?
...r in C# is immediately after ":" after the constructor.
for example
class foo
{
public foo(){}
public foo(string s ) { }
public foo (string s1, string s2) : this(s1) {....}
}
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程序员之网络安全系列（三）：数据加密之对称加密算法 - 更多技术 - 清泛网...
...jndael加密法，是美国联邦政府采用的一种区块加密标准。这个标准用来替代原先的DES，已经被多方分析且广为全世界所使用。经过五年的甄选流程，高级加密标准由美国国家标准与技术研究院（NIST）于2001年11月26日发布于FIPS PUB ...
How do you read from stdin?
...eed to read from sys.stdin, for example, if you pipe data to stdin:
$ echo foo | python -c "import sys; print(sys.stdin.read())"
foo
We can see that sys.stdin is in default text mode:
>>> import sys
>>> sys.stdin
<_io.TextIOWrapper name='<stdin>' mode='r' encoding='UTF-8'...
Elegant way to combine multiple collections of elements?
...s, each containing objects of the same type (for example, List<int> foo and List<int> bar ). If these collections were themselves in a collection (e.g., of type List<List<int>> , I could use SelectMany to combine them all into one collection.
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