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Why does Stream not implement Iterable?
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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
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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...
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);
}
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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
4
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Process.start: how to get the output?
...// do something with line
}
You can use int.Parse() or int.TryParse() to convert the strings to numeric values. You may have to do some string manipulation first if there are invalid numeric characters in the strings you read.
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