import "random" for Random var random = Random.new(12345) // Single element list. System.print(random.sample(["single"], 1)) // expect: [single] // Should choose all elements with roughly equal probability. var list = ["a", "b", "c", "d", "e"] var histogram = {} for (i in 1..5000) { var sample = random.sample(list, 1) var string = sample.toString if (!histogram.containsKey(string)) histogram[string] = 0 histogram[string] = histogram[string] + 1 } System.print(histogram.count) // expect: 5 for (key in histogram.keys) { var error = (histogram[key] / (5000 / list.count) - 1).abs if (error > 0.1) System.print("!!! %(error)") }