Whats does solid mean?

A solid is a sample of matter that retains its shape and density when not confined . The adjective solid describes the state, or condition, of matter having this property. The atom s or molecule s of matter in the solid state are generally compressed as tightly as the repulsive forces among them will allow.

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What is the symbol in Swift?

Put simply, @UIApplicationMain is an indicator for Swift applications that indicates which object is your application’s main application delegate file. In Objective-C application templates, you would have a trivial main. m C file which sets the application delegate.

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What does == mean in Swift?

The == or equality operator checks whether the two operands are equal . What equal means for an object depends on the implementation of the class or structure. For the NSArray class, the contents of the arrays are compared. In the above example, arr1 is equal to arr2 because the values stored in the arrays are equal.

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