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When to use lambda, when to use Proc.new?
...xpect:
def whowouldwin
mylambda = lambda {return "Freddy"}
mylambda.call
# mylambda gets called and returns "Freddy", and execution
# continues on the next line
return "Jason"
end
whowouldwin
#=> "Jason"
Now here's a Proc.new-created proc's return doing the same thing. You're a...
What is the theoretical maximum number of open TCP connections that a modern Linux box can have
... client per server port, and needs clarifying.
Each TCP/IP packet has basically four fields for addressing. These are:
source_ip source_port destination_ip destination_port
< client > < server >
Inside the TCP stack, these four fields are used as a compou...
How do I enable TODO/FIXME/XXX task tags in Eclipse?
In all my years of using Eclipse, I never knew until now that TODO / FIXME / XXX comment tags are supposed to appear in the task list. Apparently this is something that is disabled by default because I have been using those tags for as long as I've been using Eclipse and I have never seen one of the...
Proper use of 'yield return'
...must have the complete list before returning.
By using yield-return, you really only need to have the next item before returning.
Among other things, this helps spread the computational cost of complex calculations over a larger time-frame. For example, if the list is hooked up to a GUI and the us...
What is the purpose of the EBP frame pointer register?
...sembly language and have noticed that the x86 code emitted by compilers usually keeps the frame pointer around even in release/optimized mode when it could use the EBP register for something else.
...
CSS to stop text wrapping under image
...will be able to change its width.
display: block;
Another way, which usually makes more sense, is to use a <p> element as a parent for your <span>.
<li id="CN2787">
<img class="fav_star" src="images/fav.png">
<p>
<span>Text, text and more text</spa...
Why is 1/1/1970 the “epoch time”?
...ess than 829 days. For this reason, the time represented by the number 0 (called the epoch) had to be set in the very recent past. As this was in the early 1970s, the epoch was set to 1971-1-1.
Later, the system time was changed to increment every second, which increased the span of time that could...
Facebook database design?
...nd table that holds the UserID and then the UserID of the friend (we will call it FriendID). Both columns would be foreign keys back to the Users table.
Somewhat useful example:
Table Name: User
Columns:
UserID PK
EmailAddress
Password
Gender
DOB
Location
TableName: Friend...
Make function wait until element exists
...
If you have access to the code that creates the canvas - simply call the function right there after the canvas is created.
If you have no access to that code (eg. If it is a 3rd party code such as google maps) then what you could do is test for the existence in an interval:
var checkExis...
Why we should not use protected static in java
...ackage and classes which extend me.
The two meanings are not exactly mutually exclusive but it is pretty close.
The only case I can see where you might use the two together is if you had an abstract class that was designed to be extended and the extending class could then modify the behavior usin...