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What is the Scala identifier “implicitly”?
...erson, using a type class based approach:
trait Show[T] { def show(t: T): String }
object Show {
implicit def IntShow: Show[Int] = new Show[Int] { def show(i: Int) = i.toString }
implicit def StringShow: Show[String] = new Show[String] { def show(s: String) = s }
def ShoutyStringShow: Show[S...
How do I check if a column is empty or null in MySQL?
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This will select all rows where some_col is NULL or '' (empty string)
SELECT * FROM table WHERE some_col IS NULL OR some_col = '';
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How to concatenate two strings to build a complete path
...ipt I want user to enter a path of a directory. Then I want to append some strings at the end of this string and build a path to some subdirectories.
For example assume user enters an string like this:
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PostgreSQL query to return results as a comma separated list
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SELECT string_agg(id::text, ',') FROM table
Requires PostgreSQL 9.0 but that's not a problem.
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How do you sort a dictionary by value?
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Use:
using System.Linq.Enumerable;
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List<KeyValuePair<string, string>> myList = aDictionary.ToList();
myList.Sort(
delegate(KeyValuePair<string, string> pair1,
KeyValuePair<string, string> pair2)
{
return pair1.Value.CompareTo(pair2.Value);...
Check if a string contains a substring in SQL Server 2005, using a stored procedure
I've a string, @mainString = 'CATCH ME IF YOU CAN' . I want to check whether the word ME is inside @mainString .
2 Answ...
Get current time as formatted string in Go?
What's the best way to get the current timestamp in Go and convert to string? I need both date and time in eg. YYYYMMDDhhmmss format.
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JavaScript object: access variable property by name as string [duplicate]
...but I think it might be worth explicitly pointing out prop must be of type string and or resolve to type string.
– prasanthv
Jun 24 '15 at 0:51
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When should I use the HashSet type?
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Here's a real example of where I use a HashSet<string>:
Part of my syntax highlighter for UnrealScript files is a new feature that highlights Doxygen-style comments. I need to be able to tell if a @ or \ command is valid to determine whether to show it in gray (valid)...
how to get the one entry from hashmap without iterating
...ution is to use TreeMap (you asked for other data structures).
TreeMap<String, String> myMap = new TreeMap<String, String>();
String first = myMap.firstEntry().getValue();
String firstOther = myMap.get(myMap.firstKey());
TreeMap has an overhead so HashMap is faster, but just as an exa...