> Avoid overriding, inheritance and implicit smartness as much as possible. Write pure functions. Amen, preach it from the mountain. Can't say I agree perform

> Avoid overriding, inheritance and implicit smartness as much as possible. Write pure functions. Amen, preach it from the mountain. Can't say I agree performance is bottom of the priority pile. As someone who does numerical work semi regularly, performance can radically change the usefulness of software (interactive versus batch for example).