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How do you copy the contents of an array to a std::vector in C++ without looping?
...e arrays are perfectly valid containers for most STL algorithms--the raw pointer is equivalent to begin(), and (ptr + n) is equivalent to end().
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How can I format a nullable DateTime with ToString()?
How can I convert the nullable DateTime dt2 to a formatted string?
20 Answers
20
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How do I overload the [] operator in C# [duplicate]
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public int this[int key]
{
get => GetValue(key);
set => SetValue(key, value);
}
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Which is preferred: Nullable.HasValue or Nullable != null?
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Wow. I hate this syntactic sugar. int? x = null gives me the illusion that a nullable instance is a reference type. But the truth is that Nullable<T> is a value type. It feels I'd get a NullReferenceException to do: int? x = null; Use(x.HasValue).
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Format Instant to String
...-zone is required. Without a time-zone, the formatter does not know how to convert the instant to human date-time fields, and therefore throws an exception.
The time-zone can be added directly to the formatter using withZone().
DateTimeFormatter formatter =
DateTimeFormatter.ofLocalizedDateTim...
Why should I prefer to use member initialization lists?
...efault constructor. Consider:
class A
{
public:
A() { x = 0; }
A(int x_) { x = x_; }
int x;
};
class B
{
public:
B()
{
a.x = 3;
}
private:
A a;
};
In this case, the constructor for B will call the default constructor for A, and then initialize a.x to 3. A be...
Read environment variables in Node.js
... but don't forget that assigning a property on process.env will implicitly convert the value to a string.
Avoid Boolean Logic
Even if your .env file defines a variable like SHOULD_SEND=false or SHOULD_SEND=0, the values will be converted to strings (“false” and “0” respectively) and not...
MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer
...rgeCollection, JsonRequestBehavior.AllowGet);
jsonResult.MaxJsonLength = int.MaxValue;
return jsonResult;
}
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How to save/restore serializable object to/from file?
...riter writer = null;
try
{
var contentsToWriteToFile = JsonConvert.SerializeObject(objectToWrite);
writer = new StreamWriter(filePath, append);
writer.Write(contentsToWriteToFile);
}
finally
{
if (writer != null)
writer.Close();
}
}...
Javascript: formatting a rounded number to N decimals
... this is not a common way, e.g, toFixed(16.775, 2) return 16.77. Convert number to String then convert is the only way.
– hiway
Jun 4 '14 at 3:49
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