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How do I iterate over an NSArray?

...oding for OS X 10.6 / iOS 4.0 and above, you also have the option of using block-based APIs to enumerate arrays and other collections: [array enumerateObjectsUsingBlock:^(id object, NSUInteger idx, BOOL *stop) { // do something with object }]; You can also use -enumerateObjectsWithOptions:usi...
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Difference between map and collect in Ruby?

...ww.ruby-doc.org/core/classes/Array.html#M000249 ary.collect {|item| block } → new_ary ary.map {|item| block } → new_ary ary.collect → an_enumerator ary.map → an_enumerator Invokes block once for each element of self. Creates a new array containing the values returned ...
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Detect when an image fails to load in Javascript

...y wouldn't try and load an image that isn't there. – PHP Guru Feb 12 at 19:29 1 ...
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How to remove the border highlight on an input text element

...xample: form, label { margin: 1em auto; } label { display: block; } <form> <label>Click to see the input below to see the outline</label> <input type="text" placeholder="placeholder text" /> </form> The most common "fix" that most recom...
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How can I run an external command asynchronously from Python?

...ling of in/out buffers and there are situations where flooding these might block. – Ali Afshar Mar 11 '09 at 22:11 Ada...
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How do I set a variable to the output of a command in Bash?

... Use: %7s)\n" \ "${filesystem#*/mapper/}" "$mounted" $pct $blocks "$use" done } {list}< <(LANG=C df -k) And of course with inline documents: while IFS=\; read -u $list -a myvar ;do echo ${myvar[2]} done {list}<<"eof" foo;bar;baz alice;bob;charlie $cherry;$straw...
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How to create custom easing function with Core Animation?

...on But I think it can be made a little simpler and more readable by using blocks. So we can define a category on CAKeyframeAnimation that looks something like this: CAKeyframeAnimation+Parametric.h: // this should be a function that takes a time value between // 0.0 and 1.0 (where 0.0 is the be...
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Node.js app can't run on port 80 even though there's no other process blocking the port

I'm running an instance of Debian on Amazon EC2 with Node.js installed. If I run the code below: 9 Answers ...
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How to use ArgumentCaptor for stubbing?

... Thanks for the answer. I have a question. In the third code block we know that true is returned only when expected is passed to doSomething. But when is true returned in the second code block? Or does someObject always return true for someMethod in that case? – C...
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Node.js vs .Net performance

...hen this might not matter that much because the threads aren't going to be blocked and you're going to be able to handle a lot of requests before you run out of threads. The problem with the ASP.NET model comes when you start making I/O requests that block the thread (call to a DB, make an http req...