How do I compare two app versions in flutter?

Issue

I was trying to compare two different app version in flutter, But I am not able to assign , App versions in a variable.

var a = 1.0.0;
var b = 1.0.1;

But the values not getting assigned in variables.

I think 1.0.0 is not float value, so how to assign that value and compare them ?

Solution

A cool solution, is to convert each version to an exponential integer, so we could compare them simply as integers!

void main() {
  String v1 = '1.2.3', v2 = '1.2.11';
  int version1Number = getExtendedVersionNumber(v1); // return 102003
  int version2Number = getExtendedVersionNumber(v2); // return 102011
  print(version1Number == version2Number);
  print(version1Number >= version2Number);
  print(version1Number < version2Number);
}

int getExtendedVersionNumber(String version) {
  // Note that if you want to support bigger versions than 99, 
  // increase the returned versionCells multipliers
  List versionCells = version.split('.');
  versionCells = versionCells.map((i) => int.parse(i)).toList();
  return versionCells[0] * 10000 + versionCells[1] * 100 + versionCells[2];
}

Checkout this running example on dartpad.

Answered By - genericUser