Why every developer should read Plato
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Transcript of Why every developer should read Plato
Why every developer should read Plato
@OmarReissCTO at Yoast
Philosopher
Developer
Platomar
26%
What makes WordPress a superhero?
What makes WordPress a superhero?
How does WordPress turn users into superheroes?
We can build almost anything using WordPress
47,260 plugins
You can write a WordPress plugin with 0 lines of code.
What makes WordPress so easy to plugin to?
Filters! (and actions)
APIadd_filter
remove_filter
apply_filters
Filters
A filter is a function
A filter is a function
Timing
The plugins are loaded
WordPress is initialised
The head is rendered
The content is rendered
After
After
do_action(‘plugins_loaded’)
do_action(‘init’)
do_action(‘wp_head’)
apply_filters(‘the content’)
Before
Before
What should we use filters for?
“As a site owner, I want Yoast SEO to use the excerpt as a meta description.”
Usecase
“As a custom fields plugin builder, I want Yoast SEO to use a custom field as a meta description.”
Usecase
“As a {ROLE}, I want Yoast SEO to use {FIELD} as a meta description.”
Usecase
How does this translate to WordPress?
“As a {ROLE}, I want to be able to filter the meta description that Yoast SEO outputs.”
Usecase
Example
Example
What is a meta description?
Filter the output
Filter the data
Filtering the output
Filtering the data
Data typesString -> “hello”
Integer -> 123
Array -> [$a, $b, $c]
etc.
What is data?
Is “<html><body>Hello world</body></html>” a string?
V = f( M )
View = function( Model )
Filter data, not representation
Filter the data
Filtering the data
Can I safely filter data?
Type juggling
#YOLO
Notice: Array to string conversion…
Type checking madness
Never trust filtered data
Because #YOLO
Hey! But wasn’t this supposed to be easy?
And what does this have to do with Plato?
- Maieutike
- Irony
- Anamnesis
26%
What makes WordPress a superhero?
What makes WordPress a superhero?
How does WordPress turn users into superheroes?
We can build almost anything using WordPress
47,260 plugins
You can write a WordPress plugin with 0 lines of code.
What makes WordPress so easy to plugin to?
Filters! (and actions)
APIadd_filter
remove_filter
apply_filters
Filters
A filter is a function
What is a filter?
A filter is a function
Timing
The plugins are loaded
WordPress is initialised
The head is rendered
The content is rendered
After
After
do_action(‘plugins_loaded’)
do_action(‘init’)
do_action(‘wp_head’)
apply_filters(‘the content’)
Before
Before
What should we use filters for?
“As a site owner, I want Yoast SEO to use the excerpt as a meta description.”
Usecase
“As a custom fields plugin builder, I want Yoast SEO to use a custom field as a meta description.”
Usecase
“As a {ROLE}, I want Yoast SEO to use {FIELD} as a meta description.”
Usecase
How does this translate to WordPress?
“As a {ROLE}, I want to be able to filter the meta description that Yoast SEO outputs.”
Usecase
Example
Example
What is a meta description?
Filter the output
Filter the data
Filtering the output
Filtering the data
Data typesString -> “hello”
Integer -> 123
Array -> [$a, $b, $c]
etc.
What is data?
Is “<html><body>Hello world</body></html>” a string?
V = f( M )
View = function( Model )
Filter data, not representation
Filter the data
Filtering the data
Can I safely filter data?
Type juggling
#YOLO
Notice: Array to string conversion…
Type checking madness
Never trust filtered data
Because #YOLO
But wasn’t this supposed to be easy?
Issues with filtersIn WordPress it’s hard to distinguish representation from raw data, because of reasons.
In WordPress it’s not possible to trust filtered data, because of reasons.
In WordPress it’s not possible to know when a filter was applied, because of reasons.
Conclusion
And what does this have to do with Plato?
Why every developer should read Plato
Plato working on his art
To learn about Socrates
To learn about Plato
To practice inquiry
Thank you!
@OmarReiss
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