CODEWITHSUNDEEP
flutterdart
Abdallah Azzouni
Abdallah Azzouni

Reputation: 69

How do I check if a value is a number (even or odd) with type double in Dart?

How do I check if a value is a number (even or odd) with type double in Dart?

Upvotes: 5

Views: 18280

Answers (4)

Musab
Musab

Reputation: 261

Here is the code to detect from String.

 bool isDouble(String? s) {
  if (s == null) {
    return false;
  }
  if(int.tryParse(s)!=null){
    return false;
  }
  return double.tryParse(s)!= null;
}

Upvotes: 0

Abayomi Akanji
Abayomi Akanji

Reputation: 69

There are native methods for int to achieve that purposes. You can convert the number to an int and call number.isOdd, number.isEven...

Documentation:

abstract class int extends num {
   /// Returns true if and only if this integer is odd.
   bool get isOdd;
        
   // Returns true if and only if this integer is even.
   bool get isEven;
}

Upvotes: 4

Mahmoud Mabrouk
Mahmoud Mabrouk

Reputation: 733

You can go traditional with String evenOrOdd = number %2 == 0?'even':'odd'

Upvotes: 3

Ουιλιαμ Αρκευα
Ουιλιαμ Αρκευα

Reputation: 6257

  double value = 2.5;
  print(value.floor().isEven ? "It's even" : "It's odd");

Upvotes: 8

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