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Creating temporary files in bash

...voke mktemp something like mydir=$(mktemp -d "${TMPDIR:-/tmp/}$(basename $0).XXXXXXXXXXXX") which creates a temporary directory I can work in, and in which I can safely name the actual files something readable and useful. mktemp is not standard, but it does exist on many platforms. The "X"s will...
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How do I parse JSON with Objective-C?

... With the perspective of the OS X v10.7 and iOS 5 launches, probably the first thing to recommend now is NSJSONSerialization, Apple's supplied JSON parser. Use third-party options only as a fallback if you find that class unavailable at runtime. So, for exampl...
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How to navigate through a vector using iterators? (C++)

...tor to a vector of strings int n = 3; // nth element to be found. int i = 0; // counter. // now start at from the beginning // and keep iterating over the element till you find // nth element...or reach the end of vector. for(it = myvector.begin(); it != myvector.end(); it++,i++ ) { // fou...
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Loop through an array of strings in Bash?

...ividual element of the array done # You can access them using echo "${arr[0]}", "${arr[1]}" also Also works for multi-line array declaration declare -a arr=("element1" "element2" "element3" "element4" ) ...
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jQuery: checking if the value of a field is null (empty)

... 170 The value of a field can not be null, it's always a string value. The code will check if the st...
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Reference list item by index within Django template?

... 190 It looks like {{ data.0 }}. See Variables and lookups. ...
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Select statement to find duplicates on certain fields

... 840 To get the list of fields for which there are multiple records, you can use.. select field1,fiel...
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RootViewController Switch Transition Animation

... block: [UIView transitionWithView:self.window duration:0.5 options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{ self.window.rootViewController = newViewController; } completion:nil]; ...
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Finding three elements in an array whose sum is closest to a given number

... >= j) { // We got a match! All done. if (A[i] + A[j] + A[k] == 0) return (A[i], A[j], A[k]) // We didn't match. Let's try to get a little closer: // If the sum was too big, decrement k. // If the sum was too small, increment j. (A[i] + A[j] + A[k] > 0) ? k-- : j++...
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Comparing two CGRects

... 250 Use this: if (CGRectEqualToRect(self.view.frame, rect)) { // do some stuff } ...