General Notes Closures are reference types Global functions are closures that have names and capture no values Closures are commonly used as callback functions for network API requests The parameter to the .sorted() and .sort() functions accept closures--which illustrates that closures can also be used in …

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Constructing Strings String from Literal 1 let str = "Hello, dog!" 2 let str2 = "Hello, 🐶!" Including Escaped Characters 1 print("Backslash: \") 2 print("Tab: \t") 3 print("LF: \nThis is on the next line") 4 print ("CR\r") 5 print("Single Quote: '") 6 …

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Dictionary Fundamentals A Dictionary, provided by Foundation, is a type of hash table that stores key/value pairs. Keys must conform to Hashable Access to elements is O(1) Derived from NSDictionary Best used for key/value storage where lookup by key is the primary use case. However, Apple has added a lot of handy …

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