30秒学会 Dart 片段 – randomIntInRange

Returns a random integer in the specified range.

Use Random.nextDouble() to generate a random number between 0.0 and 1.0 and map it to the desired range, using num.floor() to make it an integer.
Omit the optional parameter, min, to use a default minimu value of 0.
Omit the optional parameter, max, to use a default maximum value of 100.

代码实现

import 'dart:math';

int randomIntInRange({int min = 0, int max = 100}) {
  return (Random().nextDouble() * (max - min + 1) + min).floor();
}

使用样例

randomIntInRange(); // 90
randomIntInRange(min: 10, max: 30); // 23