StackOverflow2013

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copied!<ul> <li><p>Built-in regular expression support (a la <a href="http://regexkit.sourceforge.net/" rel="nofollow noreferrer">RegexKit</a>) would be <em>extremely</em> handy. NSRegularExpression is available on iOS 4.0+, but it is still not available on Mac OS X yet.</p></li> <li><p>An easy way to progressively read NSString objects from a large text file without loading the entire thing into memory. (NSInputStream and NSFileHandle just don't measure up for that.)</p></li> <li><p>The ability to optionally make NSSet/NSMutableSet/NSCountedSet store and enumerate objects in sorted order (like a <a href="http://en.wikipedia.org/wiki/Binary_search_tree" rel="nofollow noreferrer">binary search tree</a>) would certainly be welcome. Same goes for Cocoa arrays — currently I have to call something like <code>-[NSArray sortedArrayUsingSelector:]</code> or <code>-[NSMutableArray sortUsingSelector:]</code> to get a sorted array, and for sets I have to create the array first.</p></li> <li><p>A heap / priority queue. A Cocoa wrapper around <a href="http://developer.apple.com/documentation/CoreFoundation/Reference/CFBinaryHeapRef/" rel="nofollow noreferrer">CFBinaryHeap</a> (which is definitely not as easy to use as Cocoa collections) would probably work.</p></li> <li><p>A dictionary that can store multiple values for each key, commonly known as a <em>multiset</em>. NSCountedSet is pretty much a multiset/bag, and it would be nice to have the same for key-value associations (NSMultiDictionary?) instead of having to roll my own.</p></li> <li><p>A friendly wrapper for <a href="http://developer.apple.com/documentation/Darwin/Conceptual/FSEvents_ProgGuide/" rel="nofollow noreferrer">FSEvents</a>. (CFFileDescriptor does some of the work, but it's not Cocoa-easy.)</p></li> <li><p>A method for creating an NSString from a format string and an array of objects (not just varargs). <a href="https://stackoverflow.com/questions/1058736/#1061750">This SO answer</a> shows an example. Getting it to work with primitives would be tricky... Maybe an NSPointerArray?</p></li> <li><p>Consistent, centralized APIs that simplify formatting (and parsing) phone numbers for a variety of locales. Currently you have to roll your own with an NSNumberFormatter (or NSScanner), and the process is tedious and error-prone. (For example, see <a href="https://stackoverflow.com/questions/665111/">NSNumberFormatter to format US Telephone Numbers</a> and <a href="https://stackoverflow.com/questions/1129521/">Remove all but numbers from NSString</a>.)</p></li> </ul> <p>Of course, I'm definitely a fan of <a href="http://cocoaheads.byu.edu/code/CHDataStructures" rel="nofollow noreferrer">a wide variety of data structures</a> in general, although Cocoa's simplicity is refreshing compared with some languages.</p>

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