protocol TeamRecord {
var wins: Int { get }
var losses: Int { get }
var winningPercentage: Double { get }
}
extension TeamRecord {
var gamesPlayed: Int {
wins + losses
}
}
extension TeamRecord {
var winningPercentage: Double {
Double(wins) / Double(wins + losses)
}
}
The book says :
While this is much like the protocol extension you defined
in the previous example, it differs in that winningPercentage
is a member of the TeamRecord protocol itself,
whereas gamesPlayed isn’t.
my question is Why these extensions are different ?
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