November 2014
Intermediate to advanced
320 pages
7h 8m
English
Content preview from Seven More Languages in Seven Weeks
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Day 2: Painting the Fence
Today, we will move our exploration of Factor from the Listener to source files. We’ll learn how to define words, organize them into modules called vocabularies, run them as standalone programs, and test them with unit tests.
Defining Words
We’ve been using Factor words that are defined in the library. Let’s see how we can define our own words. A word definition starts with a colon, a space, and the name of the word. Then comes the stack effect, the code for the word, and finally a space and a semicolon. For example:
| | : add-42 ( x -- y ) 42 + ; |
That defines a word which adds 42 to the number that’s on the stack. The ( x -- y ) part is the stack effect: the number of values that the word takes from the stack and pushes ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.