Reactive Programming in iOS with Combine

Feb 4 2021 · Swift 5.3, macOS 11.0, Xcode 12.2

Part 2: Transforming & Filtering Operators

09. Challenge: Create a Phone Number Lookup

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OK, that was a lot of information about Transforming Operators, so I’ve got a challenge for you before moving on. For this challenge, you need to create a publisher that does 2 things: receive a string of ten numbers or letters, and look up those numbers in a contacts data structure.

input
  .map(convert)
.replaceNil(with: 0)
.collect(10)
.map(format)
.map(dial)
.sink(receiveValue: { print($0) })
"0!1234567".forEach {
input.send(String($0))
}
  
"4085554321".forEach {
input.send(String($0))
}
  
"A1BJKLDGEH".forEach {
input.send("\($0)")
}