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InterviewSolution
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Explain the difference between Self and self in ios Swift. |
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Answer» There is a distinction between Self (CAPITAL S) and self (small S) when WRITING protocols and protocol EXTENSIONS. When USED with a capital S, Self refers to the protocol COMPLIANT type, such as String or Int. When used with a lowercase S, self refers to the value contained within that type, such as "hi" or 999, for instance. Consider the following SquareInteger extension as an example: extension SquareInteger { func squareANumber() -> Self { return self * self }}Remember that Self with a capital S refers to any type that follows the protocol. Because Int conforms to SquareInteger in the example above, when called on Int, the method returns an Int. Self with a lowercase S, on the other hand, refers to the type's current value. If the preceding example were run on an Int containing the value 4, the result would be 4 * 4. |
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