Swift not equal operator

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.

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.

|| Called Logical OR Operator . If any of the two operands is non-zero, then the condition becomes true.

_ : The under score operator is usually used in swift function definition. It is used to replace the function parameter’s external label.