I want to divide adynamic List int five equal parts - flutter

Question

I want to divide a dynamic list into five equal parts and take out one random number from each part. In doing so, I want to avoid duplicate numbers. Here is my code and it was not good at all.
List document;
int value1 = Random().nextInt((document.length / 5).round());
int value2 = Random().nextInt((document.length / 5).round()) +
((document.length / 5).round()) + 1;
int value3 = Random().nextInt((document.length / 5).round()) +
((document.length / 5).round() * 2) + 1;
int value4 = Random().nextInt((document.length / 5).round()) +
((document.length / 5).round() * 3) + 1;
int value5 = Random().nextInt((document.length / 5).round()) +
((document.length / 5).round() * 4) + 1;`
If you have a better way, I would appreciate it.

Answer 1

You can get this with a simple while loop and check if the element exists in the list already like the following
import "dart:math";
void main() {
List<int> intList = [];
List<int> randomList = [];
for (int i = 0; i < 100; i++) {
intList.add(i);
}
while(randomList.length < 5){
int _randomNum = Random().nextInt(intList.length);
if(randomList.contains(_randomNum) == false)
{
randomList.add(_randomNum);
}
}
print(randomList);
}