Apple WWDC 2015: OS X, watchOS, iOS and More

Tech giant Apple's annual Worldwide Developers Conference (WWDC) kicked off Monday at the Moscone West convention center in San Francisco with the headlining keynote address. Among the topics discussed during the address were new capabilities for OS X, updates coming to iOS, native apps for the Apple Watch, a streaming music service and a new version of the watchOS operating system.

At the event, Apple also introduced Swift 2, the next-generation of its programming language, which was first rolled out at last yearEUs WWDC. Apple said this new version has even better performance, a new error handling API, and better support for availability checking than its predecessor. Additionally, Apple said the platform APIs feel even more natural in Swift with enhancements to the Apple SDKs.

In addition to new features, the big news, which was well received by the audience -- is that Apple will be making Swift open source later this year. EUWe are all incredibly excited about this, and look forward to giving you a lot more information as the open source release gets nearer,EU according to a blog post on AppleEUs developer site.

However, the tech giant did say that the Swift source code will be released under an OSI-approved permissive license; contributions from the community will be accepted -- and encouraged; the company intends to contribute ports for OS X, iOS, and Linux at launch; and the source code will include the Swift compiler and standard library.

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Apple CEO Tim Cook began the keynote with introductory remarks before turning the stage over to senior vice president of Software Engineering Craig Federighi (pictured above), who took the crowd through OS X and iOS. He said 55 percent of active Mac users are running the latest update of the Yosemite OS, which he called the fastest adoption rate for...

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