Eric Elliott - Composing Software
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- Book:Composing Software
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This book is for sale at http://leanpub.com/composingsoftware
This version was published on 2019-02-24
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This is a Leanpub book. Leanpub empowers authors and publishers with the Lean Publishing process. Lean Publishing is the act of publishing an in-progress ebook using lightweight tools and many iterations to get reader feedback, pivot until you have the right book and build traction once you do.
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To my editor, JS Cheerleader, who made this book much better in too many ways to list. If you find the text readable, it is because she carefully poured over every page and offered insightful feedback and encouragement every step of the way. Without her help, you would not be reading this book right now.
To the blog readers, whos support and enthusiasm helped us turn a little blog post series into a phenomenon that attracted millions of readers and provided the momentum we needed to turn it into a book.
To the legends of computer science who paved the way.
If I have seen further it is by standing on the shoulders of Giants. ~ Sir Isaac Newton
Composition: The act of combining parts or elements to form a whole. ~ Dictionary.com
In my first high school programming class, I was instructed that software development is the act of breaking a complex problem down into smaller problems, and composing simple solutions to form a complete solution to the complex problem.
One of my biggest regrets in life is that I failed to understand the significance of that lesson early on. I learned the essence of software design far too late in life.
I have interviewed hundreds of developers. What Ive learned from those sessions is that Im not alone. Very few working software developers have a good grasp on the essence of software development. They arent aware of the most important tools we have at our disposal, or how to put them to good use. 100% have struggled to answer one or both of the most important questions in the field of software development:
- What is function composition?
- What is object composition?
The problem is that you cant avoid composition just because youre not aware of it. You still do it but you do it badly. You write code with more bugs, and make it harder for other developers to understand. This is a big problem. The effects are very costly. We spend more time maintaining software than we do creating it from scratch, and our bugs impact billions of people all over the world.
The entire world runs on software today. Every new car is a mini super-computer on wheels, and problems with software design cause real accidents and cost real human lives. In 2013, a jury found Toyotas software development team guilty of reckless disregard after an accident investigation revealed spaghetti code with 10,000 global variables.
Hackers and governments stockpile bugs in order to spy on people, steal credit cards, harness computing resources to launch Distributed Denial of Service (DDoS) attacks, crack passwords, and even manipulate elections.
We must do better.
If youre a software developer, you compose functions and data structures every day, whether you know it or not. You can do it consciously (and better), or you can do it accidentally, with duct-tape and crazy glue.
The process of software development is breaking down large problems into smaller problems, building components that solve those smaller problems, then composing those components together to form a complete application.
Function composition is the process of applying a function to the output of another function. In algebra, given two functions, 
and 
, 
. The circle is the composition operator. Its commonly pronounced composed with or after. You can say that out-loud as fcomposed withg equals f of g of x, or fafterg equals f of g of x. We say fafterg because g is evaluated first, then its output is passed as an argument to f.
Every time you write code like this, youre composing functions:
1constg=n=>n+1;2constf=n=>n*2;34constdoStuff=x=>{5constafterG=g(x);6constafterF=f(afterG);7returnafterF;8};910doStuff(20);// 42Every time you write a promise chain, youre composing functions:
1constg=n=>n+1;2constf=n=>n*2;34constwait=time=>newPromise(5(resolve,reject)=>setTimeout(6resolve,7time8)9);1011wait(300)12.then(()=>20)13.then(g)14.then(f)15.then(value=>console.log(value))// 4216;Likewise, every time you chain array method calls, lodash methods, observables (RxJS, etc) youre composing functions. If youre chaining, youre composing. If youre passing return values into other functions, youre composing. If you call two methods in a sequence, youre composing using
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