Any magic command to extract an array from array of custom objects?

Question

I have a class like this

class ValueTimestamp {
  let value: Double
  let timestamp : Double
  init(value:Double, timestamp:Double) {
    self.value = valuer
    self.timestamp = timestamp
  }
}

Then I have an array filled with ValueTimestamp objects. Let's call this, myArray.

Now I want to manipulate the array, to extract, for example the elements with values bigger than 10.

Because I am new to swift, I would do this:

// this will create an array with Doubles
let sub = myArray.map($0.value > 10)

var newArray : [ValueTimestamp] = []
for i in 0..< myArray.count {
  let newValue = ValueTimestamp.init(value:sub[i], timestamp:myArray[i])
  newArray.append(newValue)
}

and now I have newArray that contains the elements from myArray with values bigger than 10.

Is there any magic command using .map, .flatmap or whatever that can do this?

ManWithBear · Accepted Answer · 2019-03-24 02:52:15Z

2

What you looking for is filter method:

public func filter(_ isIncluded: (Element) throws -> Bool) rethrows -> [Element]

It takes as parameter closure, which take 1 element and return true if element should be added in resulting array or false if it should be filtered out.

Your code:

let biggerThem10 = myArray.filter { $0.value > 10 }

edited Mar 24, 2019 at 2:52

answered Mar 24, 2019 at 2:49

ManWithBear

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