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Is the Scala 2.8 collections library a case of “the longest suicide note in history”? [closed]
...then further generalized by only requiring that a function exists that can convert the result to whatever data structure the user wants:
map :: IterableLike i ⇒ (a → b) → i → ([b] → c) → c
I admit that the syntax is a bit clunkier, but the semantics are the same. Basically, it starts ...
Why does Stream not implement Iterable?
...
To convert a Stream to an Iterable, you can do
Stream<X> stream = null;
Iterable<X> iterable = stream::iterator
To pass a Stream to a method that expects Iterable,
void foo(Iterable<X> iterable)
simply
...
How to initialize std::vector from C-style array?
...aster than it looks.
template<typename T, size_t N>
vector<T> convert_array_to_vector(const T (&source_array)[N]) {
return vector<T>(source_array, source_array+N);
}
share
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Double not (!!) operator in PHP
...It means if $row has a truthy value, it will return true, otherwise false, converting to a boolean value.
Here is example expressions to boolean conversion from php docs.
Expression Boolean
$x = ""; FALSE
$x = null; FALSE
var $x; FALSE
$x is und...
Which are more performant, CTE or temporary tables?
...en with two CTEs in SQL server. It was taking 28sec.
I spent two minutes converting them to temp tables and the query took 3 seconds
I added an index to the temp table on the field it was being joined on and got it down to 2 seconds
Three minutes of work and now its running 12x faster all by rem...
Difference between string and char[] types in C++
... and certain functions may only accept a string as input, requiring you to convert the array to a string. It's better to use strings, they were made so that you don't have to use arrays. If arrays were objectively better we wouldn't have strings.
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Case objects vs Enumerations in Scala
...ceVal(character: Char, pointValue: Int) extends super.Val()
implicit def convert(value: Value) = value.asInstanceOf[ChessPieceVal]
}
The following items from the enumeration definition are not available (happens to be identical to the list for directly using the Java Enum):
3.1 - It would be...
Is multiplication and division using shift operators in C actually faster?
...upport fast multiplication (and
most didn't back then), the compiler would convert the multiplication
into the appropriate combinations of shifts and add/sub. And because it
knew the final goal, it could sometimes do so in less instructions than
when you explicitly wrote the shifts and the add/subs...
Generating random whole numbers in JavaScript in a specific range?
...Using binary operators (x << 0, x | 0, ~~x) instead of Math.floor() converts x into a two-complement with much smaller range than Number.MAX_SAFE_INTEGER (2³²⁻¹ vs. 2⁵³), thus you have to use it with caution!
– le_m
Jun 6 '16 at 1:49
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Jackson enum Serializing and DeSerializer
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Unfortunately this does not return the property when converting your enum to a string.
– Nicholas
May 31 '17 at 16:02
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