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https://docs.swift.org/swift-book/LanguageGuide/BasicOperators.html Basic Operators — The Swift Programming Language (Swift 5.7) Basic Operators An operator is a special symbol or phrase that you use to check, change, or combine values. For example, the addition operator (+) adds two numbers, as in let i = 1 + 2, and the logical AND operator (&&) combines two Boolean values, as in i docs.swift.o..