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Reducing Complexity
with a Component API
Ian Feather
Complexity
High risk, high fear
Intertwined
Low reuse
Technical debt
!
Complexity at
" ";
This time we’ll nail it
HTML CSS JS
SHAREDSPECIFIC
HOTELS
The rebuild
HTML CSS JS
SHAREDSPECIFIC
High Reuse
Low Reuse
HOTELS
The rebuild
HTML CSS JS
SHAREDSPECIFIC
High Reuse
Strong Caching
Low Reuse
Weak CachingHOTELS
The rebuild
HTML CSS JS
SHAREDSPECIFIC
High Reuse
Strong Caching
High Risk
Low Reuse
Weak Caching
Low Risk
HOTELS
The rebuild
HTML CSS JS
SHAREDSPECIFIC
HOTELS PLACES SEARCH THEME
High Reuse
Strong Caching

High Risk
Low Reuse
Weak Caching

Low Risk
The rebuild
HTML CSS JS
SHAREDSPECIFIC
HOTELS PLACES SEARCH THEME
High Reuse
Strong Caching

High Risk
Low Reuse
Weak Caching

Low Risk
The rebuild
HTML CSS JS
SHAREDSPECIFIC
HOTELS PLACES SEARCH THEME
High Reuse
Strong Caching

High Risk
Low Reuse
Weak Caching

Low Risk
The rebuild
This model doesn’t favour

the front end
We need a different

solution
It should feel as easy as

working on a small site
A Style Guide would

help, right?
/* Styleguide [Buttons]
!
<button class=“btn-primary”>Button</button>
<button class=“btn-secondary”>Button</button>
!
*/
!
.btn—primary {
background: blue;
}
!
.btn—secondary {
background: red;
}
A Style Guide isn’t

the mechanism
We need to decouple our

UI Layer from the application
Component Layer & API
What is a component?
Create an API to standardise

fetching these components
= component(“form/search”, {

label: search

})

<form action="/search">
<label class="accessibility" for="search-q">Search</label>
<input id="search-q" name="q" tabindex="1" type=“search"/>
<button name="search-q-submit" type="submit">Search</button>
</form>
= component(“form/search”, {

label: search

})

component(“input/search”, {

label: search,
autocomplete: true

})
<form action="/search">
<label class="accessibility" for="search-q">Search</label>
<input class="js-autocomplete" id="search-q" name=“q" />
<button name="search-q-submit" type="submit">Search</button>

<div class="js-autocomplete-container"></div>
</form>
component(“input/search”, {

label: search,
autocomplete: true

})
component("cards/collection_card", { 



double?: true,
slug: "/top-things-to-do—in-paris",
title: "Top things to do in Paris",
image_url: "/assets/paris.jpg"

})
SPECIFIC
Low Risk

Low Reuse
HOTELS PLACES SEARCH THEME
HTML CSS JS
SHARED
High Risk
High Reuse
SPECIFIC
Low Risk

Low Reuse
HOTELS PLACES SEARCH THEME
HTML CSS JS
SHARED
High Risk
High Reuse
Low Risk

High Reuse
Component Layer & API
Rizzo
!
Component Layer, API 

& Style Guide
Our Style Guide can be just

another data-driven application
A ready-made visual 

regression test suite
Enables Style Guide 

driven development
Why would you

want to use a

Component API?
You’ll have

happier developers
You’ll have

visual consistency
You’ll be able to

refactor easily
You won’t have to

tweak padding values

(as much)
It can feel like working

on a small site
Thank you
@ianfeather



http://rizzo.lonelyplanet.com

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Reducing complexity with a Component API