>> if you have pipes/filters, you stay free of error handling: when a filter doesn't have a result, it just doesn't pass any data to the next filter in line. T

>> if you have pipes/filters, you stay free of error handling: when a filter doesn't have a result, it just doesn't pass any data to the next filter in line. That is an important root insight. It also applies to for loops, and could apply to switch statements switch result { case something: break case none: error: empty: default: //? }