Eris\Generator\FrequencyGenerator::__construct PHP Method

    public function __construct(array $generatorsWithFrequency)
    {
        if (empty($generatorsWithFrequency)) {
            throw new InvalidArgumentException('Cannot choose from an empty array of generators');
        }
        $this->generators = array_reduce($generatorsWithFrequency, function ($generators, $generatorWithFrequency) {
            list($frequency, $generator) = $generatorWithFrequency;
            $frequency = $this->ensureIsFrequency($generatorWithFrequency[0]);
            $generator = ensureIsGenerator($generatorWithFrequency[1]);
            if ($frequency > 0) {
                $generators[] = ['generator' => $generator, 'frequency' => $frequency];
            }
            return $generators;
        }, []);
    }