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Scala @ operator
...en pattern matching variable @ pattern binds variable to the value matched by pattern if the pattern matches. In this case that means that the value of x will be Some(Nil) in that case-clause.
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Using usort in php with a class private function
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In this example I am sorting by a field inside the array called AverageVote.
You could include the method inside the call, which means you no longer have the class scope problem, like this...
usort($firstArray, function ($a, $b) {
if...
What are '$$' used for in PL/pgSQL
...CE FUNCTION check_phone_number(text)
RETURNS boolean AS <code delimited by $$> LANGUAGE plpgsql STRICT IMMUTABLE;
The stuff after the actual definition are options to give the database more information about your function, so it can optimize its usage.
In fact if you look under "4.1.2.2. Do...
How can I tell Moq to return a Task?
...ask.Delay(1) as an easy way to return a Task. You can also mimic work too by increasing the time argument.
– stevethethread
Apr 18 '16 at 11:10
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How to wait for all goroutines to finish without using time.Sleep?
...lue will copy it and make wg.Done() ineffective. While this could be fixed by passing a pointer &wg, a better way to prevent such errors is to declare the WaitGroup variable as a pointer in the first place: wg := new(sync.WaitGroup) instead of var wg sync.WaitGroup.
– Rober...
Rails.env vs RAILS_ENV
...lass gives
you a prettier way to test for
equality. The value returned by
Rails.env is wrapped in a
StringInquirer object so instead of
calling this:
Rails.env == "production"
you can call this:
Rails.env.production?
So they aren't exactly equivalent, but they're fairly close....
Stretch child div height to fill parent that has dynamic height
...S on the child. That's because a CSS Grid cell will have auto row and cell by default. It actually works pretty nicely with IE if you use display: -ms-grid to avoid some flexbugs, as long you only have one child.
– ShortFuse
Feb 14 '19 at 22:20
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Visual Studio Editor does not underline errors anymore
... i had to do it in 2012 and 2013. why would this be turned off by default!!
– Sonic Soul
Jan 10 '14 at 19:01
10
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Redefining NULL
...aranteed to be 0.
In short, this very condition was apparently considered by the C language committee, and considerations made for those who would choose an alternate representation for NULL. All you have to do now is make major changes to your compiler, and hey presto you're done :)
As a side not...
Arrays, heap and stack and value types
... public long L;
}
The values of each of these types would require 16 bytes of memory (assuming a 32-bit word size). The field I in each case takes 4 bytes to store its value, the field S takes 4 bytes to store its reference, and the field L takes 8 bytes to store its value. So the memory for...