A video tutorial for the factor programming language

a brief but detailed exploration of the UF/uxn internals

If you think this article is going to start a new discussion about an old controversy, you’re dead wrong. Instead, we will present a new way to solve your problems by using a simple concept, called lookup tables.

A natural question that beginners often ask is: Why doesn’t Forth have features that are standard in other languages, for example, arrays? The answer is that Forth is so facile at creating new data types that it is usually easier to invent something that exactly suits your needs than it is to force your program to conform to an arbitrary standard.

The DOES> concept seems to be one of the most misunderstood and mystifying aspects of Forth. Yet DOES> is also one of Forth’s most powerful features – in many ways, it anticipated object- oriented programming. The action and power of DOES> hinges upon a brilliant innovation of Forth: the Code Field.