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What is the difference between pluck and collect in Rails?
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Yes. According to Rails guides, pluck directly converts a database result into an array, without constructing ActiveRecord objects. This means better performance for a large or often-running query.
In addition to @apneadiving's answer, pluck can take both single and mult...
How to initialize a List to a given size (as opposed to capacity)?
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Create an array with the number of items you want first and then convert the array in to a List.
int[] fakeArray = new int[10];
List<int> list = fakeArray.ToList();
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improv...
How to split a string, but also keep the delimiters?
...haracters.
Can you use zero-width matching regex in String split?
How do I convert CamelCase into human-readable names in Java?
Backreferences in lookbehind
See also
regular-expressions.info/Lookarounds
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How to parse/format dates with LocalDateTime? (Java 8)
...o apply DateTimeFormatter since LocalDateTime is already prepared for it:
Convert LocalDateTime to Time Zone ISO8601 String
LocalDateTime ldt = LocalDateTime.now();
ZonedDateTime zdt = ldt.atZone(ZoneOffset.UTC); //you might use a different zone
String iso8601 = zdt.toString();
Convert from ISO...
How to TryParse for Enum value?
...rts enum marked with the Flags attribute.
/// <summary>
/// Converts the string representation of an enum to its Enum equivalent value. A return value indicates whether the operation succeeded.
/// This method does not rely on Enum.Parse and therefore will never raise any first or...
How do I parse a string with a decimal point to a double?
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I like to use the XmlConvert class ... do you have any ideas whether this is better, worse, and/or different than using CultureInfo.InvariantCulture?
– ChrisW
Aug 30 '09 at 21:23
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Combining two Series into a DataFrame in pandas
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If I may answer this.
The fundamentals behind converting series to data frame is to understand that
1. At conceptual level, every column in data frame is a series.
2. And, every column name is a key name that maps to a series.
If you keep above two concepts in mind, y...
iPhone - Get Position of UIView within entire UIWindow
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That's an easy one:
[aView convertPoint:localPosition toView:nil];
... converts a point in local coordinate space to window coordinates. You can use this method to calculate a view's origin in window space like this:
[aView.superview convertPoint:aV...
When would I need a SecureString in .NET?
...g a Chicken-and-Egg problem, so even though most current scenarios require converting them back into regular strings to make any use of them at all, their existence in the framework now means better support for them in the future - at least to a point where your program doesn't have to be the weak l...
Simple insecure two-way data “obfuscation”?
...region
return UTFEncoder.GetString(decryptedBytes);
}
/// Convert a string to a byte array. NOTE: Normally we'd create a Byte Array from a string using an ASCII encoding (like so).
// System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
// return ...