Programming language concept - G Please let me know if you need more time. Progr

Question

Programming language concept - G

Please let me know if you need more time.

Programming language concept - G The following questions refer to associative arrays in the Swift language: (a) What term does Swift use instead of associative array? (b) The type of an associative array in Swift can be written in the form [X: Y], where X and Y are the names of other Swift types. Explain the meaning of this notation. (c) Does Swift require that the keys for an associative array be strings, or are other types permitted? If other types are permitted, list them. What Swift statement is used to iterate over the key-value pairs in an associative array?

Explanation / Answer

Swift provides two collection types, known as arrays and dictionaries, for storing collections of values. Arrays store ordered lists of values of the same type. Dictionaries store unordered collections of values of the same type, which can be referenced and looked up through a unique identifier (also known as a key).

Arrays and dictionaries in Swift are always clear about the types of values and keys that they can store. This means that you cannot insert a value of the wrong type into an array or dictionary by mistake. It also means you can be confident about the types of values you will retrieve from an array or dictionary. Swift

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