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example of copy constructor with default values for immutability
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| struct Scorekeeper { | |
| let runningScore: Int | |
| let climbingScore: Int | |
| let bikingScore: Int | |
| let swimmingScore: Int | |
| init(runningScore: Int = 0, climbingScore: Int = 0, bikingScore: Int = 0, swimmingScore: Int = 0) { | |
| self.runningScore = runningScore | |
| self.climbingScore = climbingScore | |
| self.bikingScore = bikingScore | |
| self.swimmingScore = swimmingScore | |
| } | |
| init(scoreKeeper: Scorekeeper, runningScore: Int? = nil, climbingScore: Int? = nil, bikingScore: Int? = nil, swimmingScore: Int? = nil) { | |
| self.runningScore = runningScore ?? scoreKeeper.runningScore | |
| self.climbingScore = climbingScore ?? scoreKeeper.climbingScore | |
| self.bikingScore = bikingScore ?? scoreKeeper.bikingScore | |
| self.swimmingScore = swimmingScore ?? scoreKeeper.swimmingScore | |
| } | |
| func incrementRunningScoreBy(points: Int) -> Scorekeeper { | |
| return Scorekeeper(scoreKeeper: self, runningScore: self.runningScore + points) | |
| } | |
| } |
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This is a great idea. I have question, what would you do, says you have an array of Scorekeepers and you want to update element where
runningScoreequal to10and also the position of element after updated has to be the same as it were. I don't know how to approach this in Functional Programming way. Could you enlighten me?