simonbromberg

extension Double {
    // Given a value to round and a factor to round to,
    // round the value to the nearest multiple of that factor.
    mutating func round(toNearest: Double) {
        self = (self / toNearest).rounded() * toNearest
    }
    
    // Given a value to round and a factor to round to,
    // round the value DOWN to the largest previous multiple
    // of that factor.