Programming in Swift: Functions & Types

Jan 4 2022 Swift 5.5, iOS 15, Xcode 13

Part 2: Closures

17. filter, reduce, & sort

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Previous episode: 16. Challenge: Closures & Collections Next episode: 18. Challenge: filter & reduce

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Update Notes: This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.

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This is the last episode that will focus on using closures and collections together, and here, we’ll tackle filter, reduce, and the sort methods.

dwarves.filter(<#T##isIncluded: (String) throws -> Bool##(String) throws -> Bool#>)  
  dwarves.filter { (<#String#>) -> Bool in
    <#code#>
  }
  dwarves.filter { (😺dwarf🛑) -> Bool in
    dwarf > "M"
  dwarves.filter { ❌(dwarf) -> Bool in❌
    dwarf > "M"
  }
dwarves.filter { $0 > "M" }
  var totalGrade = ❌0
  for grade in grades {
    totalGrade += grade
  }❌
var totalGrade = 😺grades.reduce(<#T##initialResult: Result##Result#>, <#T##nextPartialResult: (Result, Int) throws -> Result##(Result, Int) throws -> Result#>)
grades.reduce(😺0🛑) { 

}
let totalGrade = grades.reduce(0) { (<#Result#>, <#Int#>) -> Result in
    <#code#>
  }
grades.reduce(0) { 😺total, grade🛑 -> Result
grades.reduce(0) { total, grade -> 😺Int🛑 in
  total + grade
getPassStatus(for: ozmaGrades, lowestPass: 60)
  let totalGrade = grades.reduce(0, 😺+) //{ total, grade -> Int in
//    total + grade
//  }🛑
let stockSums = 
let stockSums = stock.reduce(into: <#T##Result#>, <#T##updateAccumulatingResult: (inout Result, (key: Double, value: Int)) throws -> ()##(inout Result, (key: Double, value: Int)) throws -> ()#>)
let stockSums = stock.reduce(into: 😺[]) { (<#inout Result#>, <#(key: Double, value: Int)#>) in
  <#code#>
}
let stockSums = stock.reduce(into: []) { (😺result, item🛑) in
  result.append(item.key * Double(item.value))
names.sort()
names.sort { (a, b) -> Bool in

}
  a > b
}
names
names.sort(by: >)
let longToShortNames = names.sorted {
  
}
let longToShortNames = names.sorted {
  $0.count > $1.count
}
longToShortNames
names
  dwarves.filter { $0 > "M" }
}.sorted()