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Operators are Functions

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Operators such as \+, \-, ?? are a kind of function named using symbols rather than letters. They are invoked differently from functions:

You can read more about basic operators and advanced operators in The Swift Programming Language.

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Functions:
*Functions
*Basic Use
*Methods
*Functions with Parameters
*Subscripts
*Operators are Functions
*Variadic Parameters
*Throwing Errors
*Inout Parameters
*Returning Values
*Functions With Closures
*Passing and returning functions
*Function types
*Trailing Closure Syntax
Table Of Contents