public static decimal AccumulateCompoundInterest <TSource>(this IEnumerable <TSource> source, Func <TSource, decimal> selector)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (selector == null)
{
throw new ArgumentNullException(nameof(selector));
}
decimal cumulativePercentage = 0M;
checked
{
foreach (TSource item in source)
{
cumulativePercentage = cumulativePercentage.AccumulateCompoundInterest(selector(item));
}
}
return(cumulativePercentage);
}
public void AccumulateCompoundInterest_ScalarToScalar_Decimal_GivenCumulativeInterestAndCurrentInterest_NewCumulativeInterestReturned(decimal currentInterest, decimal cumulativeInterest, decimal resultExpected)
{
cumulativeInterest.AccumulateCompoundInterest(currentInterest).Should().Be(resultExpected);
}