Syntax Trees

Will Klein

Developer

Experience

 

Convention Tests

Convention Tests, AKA

• Linters
• Code analyzers
• Static analysis

What If We could write our own convention tests?

Convention Test "Frameworks"

• Common tests included
• Pluggable testing API
• ESLint, for example

// Life, Universe, and Everything
var answer = 6 * 7;

// Life, Universe, and Everything
var answer = 6 * 7;

10111010001011011101000101

...

How does this work?

// Life, Universe, and Everything
var answer = 6 * 7;

[var] [answer] [=] [6] [*] [7][;]

...

Tokenize

// Life, Universe, and Everything
var answer = 6 * 7;

[var] [answer] [=] [6] [*] [7][;]

...

...

Syntax Tree!

Parse

ESLint

• Builds our syntax tree for us
• Iterates over nodes in the tree
• For each node, do we have a test?

github.com/willklein/scaling-best-practices

Docs & Code

http://willkle.in

will.klein@gmail.com

Thanks

@willslab