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What's the difference between a proc and a lambda in Ruby?
...g lambda {} gives you a proc that checks the number of arguments passed to it. From ri Kernel#lambda:
Equivalent to Proc.new, except the resulting Proc objects check the number of parameters passed when called.
An example:
p = Proc.new {|a, b| puts a**2+b**2 } # => #<Proc:0x3c7d28@(irb)...
Advantages of Antlr (versus say, lex/yacc/bison) [closed]
...sually translators (such as a subset of EDIF streamed into an EDA app). Additionally, I've had to support code based on lex/yacc grammars dating back decades. So I know my way around the tools, though I'm no expert.
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What is “stdafx.h” used for in Visual Studio?
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All C++ compilers have one serious performance problem to deal with. Compiling C++ code is a long, slow process.
Compiling headers included on top of C++ files is a very long, slow process. Compiling the huge header structures that form part of Windows API and other large API libraries i...
Move all files except one
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I got something wrong when I tested the command for many items: mv ~/Linux/Old/!(Tux.png Tux1.png Tux2.png) ~/Linux/New/ It empties the whole Old -directory. What is wrong?
– Léo Léopold Hertz 준영
Mar 22 '09 at 3:28
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Is there a way to recover from an accidental “svn revert”?
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No, (absolutely) NO.
If you say to Subversion it should revert a file, all changes are gone by the wind.
Only your memory can get them back.
Exception: New files you had added, will only lose their status "added", but the file will remain in this directory, only sta...
How do I implement basic “Long Polling”?
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It's simpler than I initially thought.. Basically you have a page that does nothing, until the data you want to send is available (say, a new message arrives).
Here is a really basic example, which sends a simple string afte...
Static/Dynamic vs Strong/Weak
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Static/Dynamic Typing is about when type information is acquired (Either at compile time or at runtime)
Strong/Weak Typing is about how strictly types are distinguished (e.g. whether the language tries to do an implicit conversion from strings to numbers).
See the wiki-page for more detail...
What’s the best RESTful method to return total number of items in an object?
I’m developing a REST API service for a large social networking website I’m involved in. So far, it’s working great. I can issue GET , POST , PUT and DELETE requests to object URLs and affect my data. However, this data is paged (limited to 30 results at a time).
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Undo working copy modifications of one file in Git?
After the last commit, I modified a bunch of files in my working copy, but I want to undo the changes to one of those files, as in reset it to the same state as the most recent commit.
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How do I add a delay in a JavaScript loop?
...tion is non-blocking and will return immediately. Therefore your loop will iterate very quickly and it will initiate 3-second timeout triggers one after the other in quick succession. That is why your first alerts pops up after 3 seconds, and all the rest follow in succession without any delay.
You...