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How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...z = {**x, **y}
In Python 2, (or 3.4 or lower) write a function:
def merge_two_dicts(x, y):
z = x.copy() # start with x's keys and values
z.update(y) # modifies z with y's keys and values & returns None
return z
and now:
z = merge_two_dicts(x, y)
In Python 3.9.0a4 or greater...
What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...ing, and reduction rules, as usual in C-H. See: en.wikipedia.org/wiki/Modal_logic and cs.cmu.edu/~fp/papers/mscs00.pdf
– RD1
Jul 30 '10 at 11:13
2
...
How does Java handle integer underflows and overflows and how would you check for it?
...int left, int right) {
if (right < 0 && right != Integer.MIN_VALUE) {
return willSubtractionOverflow(left, -right);
} else {
return (~(left ^ right) & (left ^ (left + right))) < 0;
}
}
public static boolean willSubtractionOverflow(int left, int right) {...
Secure hash and salt for PHP passwords
...This answer was written in 2008.
Since then, PHP has given us password_hash and password_verify and, since their introduction, they are the recommended password hashing & checking method.
The theory of the answer is still a good read though.
TL;DR
Don'ts
Don't limit what character...
Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
...n value").
Note: Git 2.25.1 (Feb. 2020) proposes in commit 9c8a294:
empty_tree=$(git mktree </dev/null)
# Windows:
git mktree <NUL
And adds:
As a historical note, the function now known as repo_read_object_file() was taught the empty tree in 346245a1bb ("hard-code the empty tree object...
How to develop a soft keyboard for Android? [closed]
..."/", "+", "-", "9", "0", "1", "4", "@", "5", "7", "(", "2",
"\"", "6", "_", "=", "]", "[", "<", ">", "|" };
private Button mB[] = new Button[32];
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
setContentView(R.layout.main);
...
Pointers vs. values in parameters and return values
... of how the type is used"
Reference : https://golang.org/doc/faq#methods_on_values_or_pointers
Edit : Another important thing is to know the actual "type" that you are sending to function. The type can either be a 'value type' or 'reference type'.
Even as slices and maps acts as references, ...
Reset/remove CSS styles for element only
...g last. This should be the new accepted answer.
– JS_Riddler
Sep 17 '15 at 20:17
2
Microsoft lis...
Class does not implement its superclass's required members
...move on. The full story is given in my book: apeth.com/swiftBook/ch04.html#_class_initializers
– matt
Aug 20 '15 at 3:41
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show 1 more comme...
std::wstring VS std::string
...
string? wstring?
std::string is a basic_string templated on a char, and std::wstring on a wchar_t.
char vs. wchar_t
char is supposed to hold a character, usually an 8-bit character.
wchar_t is supposed to hold a wide character, and then, things get tricky:
On Li...