C# lambda expression reverse direction
That’s just less than or equal. I don’t think C# lambdas work like that. It’s too early in the morning. You need coffee.
operators
javascript i++ vs ++i [duplicate]
The difference between i++ and ++i is the value of the expression. The value i++ is the value of i before the increment. The value of ++i is the value of i after the increment. Example: var i = 42; alert(i++); // shows 42 alert(i); // shows 43 i = 42; alert(++i); // shows 43 … Read more
ruby operator “=~” [duplicate]
The =~ operator matches the regular expression against a string, and it returns either the offset of the match from the string if it is found, otherwise nil. /mi/ =~ “hi mike” # => 3 “hi mike” =~ /mi/ # => 3 “mike” =~ /ruby/ # => nil You can place the string/regex on either … Read more
How to use greater than operator with date?
you have enlosed start_date with single quote causing it to become string, use backtick instead SELECT * FROM `la_schedule` WHERE `start_date` > ‘2012-11-18’; SQLFiddle Demo
Scala @ operator
It enables one to bind a matched pattern to a variable. Consider the following, for instance: val o: Option[Int] = Some(2) You can easily extract the content: o match { case Some(x) => println(x) case None => } But what if you wanted not the content of Some, but the option itself? That would be … Read more
String concatenation does not work in SQLite
Try using || in place of + select locationname || ‘<p>’ from location; From SQLite documentation: The || operator is “concatenate” – it joins together the two strings of its operands.
Why doesn’t Ruby support i++ or i– (increment/decrement operators)?
Here is how Matz(Yukihiro Matsumoto) explains it in an old thread: Hi, In message “[ruby-talk:02706] X++?” on 00/05/10, Aleksi Niemelä <aleksi.niemela@cinnober.com> writes: |I got an idea from http://www.pragprog.com:8080/rubyfaq/rubyfaq-5.html#ss5.3 |and thought to try. I didn’t manage to make “auto(in|de)crement” working so |could somebody help here? Does this contain some errors or is the idea |wrong? (1) … Read more
What does |= (single pipe equal) and &=(single ampersand equal) mean
They’re compound assignment operators, translating (very loosely) x |= y; into x = x | y; and the same for &. There’s a bit more detail in a few cases regarding an implicit cast, and the target variable is only evaluated once, but that’s basically the gist of it. In terms of the non-compound operators, … Read more
What’s the difference between “mod” and “remainder”?
There is a difference between modulus and remainder. For example: -21 mod 4 is 3 because -21 + 4 x 6 is 3. But -21 divided by 4 gives -5 with a remainder of -1. For positive values, there is no difference.
What is a Question Mark “?” and Colon “:” Operator Used for? [duplicate]
This is the ternary conditional operator, which can be used anywhere, not just the print statement. It’s sometimes just called “the ternary operator”, but it’s not the only ternary operator, just the most common one. Here’s a good example from Wikipedia demonstrating how it works: A traditional if-else construct in C, Java and JavaScript is … Read more