Array

Given an vector of weighted probabilities, this property return a random index considering the given probabilities. The vector doesn’t need to be normalized, every value will be taken into account.

let probabilities = [0.2, 0.3, 0.1, 0.4]
(0...1000).forEach {
    print(probabilities.weightedRandomIndex)
}
// This is most likely to print: 20% = 0, 30% 1, 10% = 2, 40% = 3

Non-normalized vectors can also be used.