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Jayson is displaying the contents of a JSON file in an outline view. Why is that such a big deal? Well you already know how to use an outline view since it is a standard macOS control used in Finder, Xcode and many other apps. You intuitively know how to use the most important features. Although there are many small hidden features that make your life easier.
mac  javascript 
january 2017 by rmateu
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