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Swift Functional Programming - Second Edition by Dr. Fatih Nayebi

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The identifier pattern

An identifier pattern matches any value and binds the matched value to a variable or constant name. For instance, in the following example, ourConstant is an identifier pattern that matches the value of 7:

let ourConstant = 7 switch ourConstant { case 7: print("7") default: print("a value") } 

An identifier pattern is a sub-pattern of the value-binding pattern.

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