[GRiMe2D]

Swift actually passes value types by reference on closures (anonymous functions) if they aren't explicitly listed in capture group. It's per spec. It allows you to write closures with states:

  var count = 0
  let closure = {
    count += 1
    print("Current count=", count)
  }
  
  closure() // Current count= 1
  closure() // Current count= 2
  closure() // Current count= 3
  
  let capturedVariableClosure = { [count] in 
    print("Current count=", count)
    //count += 1 // syntax error, count is const variable. Use var count in capture group
  }
  
  capturedVariableCount() // Current count= 3
  closure() // Current count= 4
  capturedVariableCount() // Current count= 3

[jb1991]

I think you meant to call your second closure `capturedVariableCount`