WebMay 30, 2015 · Each object, under ARC, contains a reference counter, stored as an extra field in memory, which is incremented every time you set a variable to that object (i.e. a new reference to the object is created), and is decremented every time you set a reference to the object to nil/null, or a reference goes out of scope (i.e. it is deleted when the ... WebMay 30, 2015 · Swift 4: Swift 4 introduces (SE-0165) the ability to include a default value with a dictionary lookup, and the resulting value can be mutated with operations such as += and -=, so: counts[item] = (counts[item] ?? 0) + 1 becomes: counts[item, default: 0] += 1 That makes it easy to do the counting operation in one concise line using forEach:
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