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Using do block vs braces {}
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Ruby cookbook says bracket syntax has higher precedence order than do..end
Keep in mind that the bracket syntax
has a higher precedence than the
do..end syntax. Consider the following
two snippets of code:
1.upto 3 do |x|
puts x
end
1.upto 3 { |x| puts x }
# SyntaxE...
What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...the title says: what does it mean to encapsulate a variable in {} , "" , or "{} "? I haven't been able to find any explanations online about this - I haven't been able to refer to them except for using the symbols, which doesn't yield anything.
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Multiple commands on a single line in a Windows batch file
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Use:
echo %time% & dir & echo %time%
This is, from memory, equivalent to the semi-colon separator in bash and other UNIXy shells.
There's also && (or ||) which only executes the second command if the first succeeded (or failed), but the single ampersand & is what y...
/etc/apt/sources.list" E212: Can't open file for writing
I am trying to edit sources.list using vi editor but getting the following error while saving the file:
12 Answers
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Is JavaScript supported in an email message?
Is JavaScript supported in an email message?
10 Answers
10
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Client-server synchronization pattern / algorithm?
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You should look at how distributed change management works. Look at SVN, CVS and other repositories that manage deltas work.
You have several use cases.
Synchronize changes. Your change-log (or delta history) approach looks good for this. Clients send their deltas to the s...
Why can't I access DateTime->date in PHP's DateTime class?
...s a known issue.
Date being available is actually a side-effect of support for var_dump() here – derick@php.net
For some reason, you're not supposed to be able to access the property but var_dump shows it anyways. If you really want to get the date in that format, use the DateTime::format() ...
What is the difference between onPause() and onStop() of Android Activites?
...id.com/reference/android/app/Activity.html ,
it said 'Activity comes into foreground' will call onPause() , and 'Activity is no longer visible' will call onStop() .
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How to make an ng-click event conditional?
...f link should be disabled.
But other problem is that ngDisabled does not work on anything except form controls, so you can't use it with <a>, but you can use it with <button> and style it as link.
Another way is to use lazy evaluation of expressions like isDisabled || action() so actio...
Composite Key with EF 4.1 Code First
...u can mark both ActivityID and ActivityName properties with Key annotation or you can use fluent API as described by @taylonr.
Edit:
This should work - composite key defined with annotations requires explicit column order:
public class ActivityType
{
[Key, Column(Order = 0)]
public int Ac...