swift语言点评三 - Basic Operators
1、Tuples are compared from left to right, one value at a time, until the comparison finds two values that aren’t equal.
(1, "zebra") < (2, "apple")
You can compare two tuples if they have the same type and the same number of values. Tuples are compared from left to right, one value at a time, until the comparison finds two values that aren’t equal.
2、nil-coalescing operator (a ?? b)
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