How to get a random number from range in dart? - dart

Question

How does one get a random number within a range similar to c# Random.Next(int min, int max);

Answer 1

import 'dart:math';
final _random = new Random();
/**
* Generates a positive random integer uniformly distributed on the range
* from [min], inclusive, to [max], exclusive.
*/
int next(int min, int max) => min + _random.nextInt(max - min);

Answer 2

Range can be found with a simple formula as follows
Random rnd;
int min = 5;
int max = 10;
rnd = new Random();
r = min + rnd.nextInt(max - min);
print("$r is in the range of $min and $max");

Answer 3

You can achieve it via Random class object random.nextInt(max) . The nextInt() method requires a max limit. The random number starts from 0 and the max limit itself is exclusive.
import 'dart:math';
Random random = new Random();
int randomNumber = random.nextInt(100); // from 0 upto 99 included
If you want to add the min limit, add the min limit to the result
int randomNumber = random.nextInt(90) + 10; // from 10 upto 99 included

Answer 4

This is really late, but this for anyone who still has the question.
The easiest way to get a random number between a min and a max is the following :
import 'dart:math';
int max = 10;
int randomNumber = Random().nextInt(max) + 1;
The math module in dart has a function called nextInt. This will return an integer from 0 (including 0 ) to max - 1 ( exluding max ). I want a number 1 to 10, hence I add 1 to the nextInt result.

Answer 5

Generates a random integer uniformly distributed in the
range from [min] to [max], both inclusive.
int nextInt(int min, int max) => min + _random.nextInt((max + 1) - min);

Answer 6

It can be achieved exactly as you intended by creating extension on int to get random int value. For example:
import 'dart:math';
import 'package:flutter/foundation.dart';
extension RandomInt on int {
static int generate({int min = 0, #required int max}) {
final _random = Random();
return min + _random.nextInt(max - min);
}
}
And you can use this in your code like so:
List<int> rands = [];
for (int j = 0; j < 19; j++) {
rands.add(RandomInt.generate(max: 50));
}
Note that static extension methods can't be called on type itself (e.g. int.generate(min:10, max:20)), but instead you have to use extension name itself, in this example RandomInt. For detailed discussion, read here.

Answer 7

import 'dart:math';
Random rnd = new Random();
// Define min and max value
int min = 1, max = 10;
//Getting range
int num = min + rnd.nextInt(max - min);
print("$num is in the range of $min and $max");

Answer 8

To generate a random double within a range, multiply a random int with a random double.
import 'dart:math';
Random random = new Random();
int min = 1, max = 10;
double num = (min + random.nextInt(max - min)) * random.nextDouble();

Answer 9

To Generate a random positive integer between a given range:
final _random = new Random();
// from MIN(inclusive), to MAX(exclusive).
int randomBetween(int min, int max) => min + _random.nextInt(max - min);
// from MIN(inclusive), to MAX(inclusive).
int randomBetween(int min, int max) => min + _random.nextInt((max+1) - min);
// from MIN(exclusive), to MAX(exclusive).
int randomBetween(int min, int max) => (min+1) + _random.nextInt(max - (min+1));

Answer 10

When I was making a Tetris game, I had to rotate the x-axis. For this, I wrote the following codes.
I hope it will be useful for you too:
Random rnd = Random();
int min = 0;
int max = 23;
class Block {
int x = min + rnd.nextInt(max - min);
}

Answer 11

A simpler way of doing this is to use the nextInt method within Random:
// Random 50 to 100:
int min = 50;
int max = 100;
int selection = min + (Random(1).nextInt(max-min));
https://api.dartlang.org/stable/2.0.0/dart-math/Random-class.html