Titlebook: Swift Quick Syntax Reference; Matthew Campbell Book 2014 Matthew Campbell 2014

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Type Aliases,You can add an alternative name for existing types using type aliases. This is something you might do if you want to make your API more expressive and clearer to other programmers. For instance, let’s say you had a type of string that you wanted to treat as a note in your code. You could use a type alias to define . as an alternative to ..

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Global and Local Variables,Most of the variables that you have been working with in the examples have had global scope. . means that once the variable is declared, you can access its value from anywhere in your Swift program. This is in contrast to Objective-C, which couldn’t have variables with global scope.

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Comparison Operators,You use . operators to compare two values. You can test for equality or whether one value is greater or less than another value.

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Ternary Conditional Operator,You use the . conditional operator to evaluate a question and then do one of two things based on the result of the question. The ternary conditional operator is written like this: . (see Listing 16-1).

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