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Groovyで整数範囲(IntRange)を拡張してその範囲でランダムな値を返せるようにする

Groovy

Last updated at 2012-12-26Posted at 2012-12-02

intRangeRandom.groovy

IntRange.metaClass.define {
  random {
    [delegate.from, delegate.to].min() + new Random().nextInt(delegate.size())
  }
}

assert (1..10).random() in 1..10 // => 1〜10
assert (5..<1).random() in 2..5  // => 2〜5

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