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Hack - Why Should I Care?
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Joel Clermont
April 23, 2015
Programming
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55
Hack - Why Should I Care?
version given at Nomad PHP EU in April 2015
Joel Clermont
April 23, 2015
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Transcript
Hack Why Should I Care? Joel Clermont @jclermont
What to expect • No insider secrets
What to expect • No insider secrets • High-level tour
of Hack’s unique features
What to expect • No insider secrets • High-level tour
of Hack’s unique features • Make the case why you should try it out
What to expect • No insider secrets • High-level tour
of Hack’s unique features • Make the case why you should try it out • Show you how to get started
What to expect • No insider secrets • High-level tour
of Hack’s unique features • Make the case why you should try it out • Show you how to get started • Answer all your questions
Quick Tour of Hack
Type Annotations
Type Annotations
Type Annotations
Type Annotations Where do we need them?
Type Annotations Where do we need them? 1
Type Annotations Where do we need them? 1 2
Type Annotations Where do we need them? 1 2 3
Type Annotations Where do we need them? 1 2 3
Type Annotations Where do we need them?
Type Annotations What do we get out of it? •
Easier for developers to understand intent
Type Annotations What do we get out of it? •
Easier for developers to understand intent • Correctness of our type system
Type Annotations What do we get out of it? •
Easier for developers to understand intent • Correctness of our type system • Easier to refactor
Doesn’t PHP already have type hints?
Doesn’t PHP already have type hints? • Scalar type hints
Doesn’t PHP already have type hints? • Scalar type hints
• Typed arrays
Doesn’t PHP already have type hints? • Scalar type hints
• Typed arrays • Nullable types
Doesn’t PHP already have type hints? • Scalar type hints
• Typed arrays • Nullable types • Function return type hints
Doesn’t PHP already have type hints? • Scalar type hints
• Typed arrays • Nullable types • Function return type hints • Type checker
More useful Hack types
More useful Hack types
More useful Hack types
More useful Hack types
More useful Hack types
Questions?
Still not convinced? DEMO
What’s wrong?
What’s wrong?
What’s wrong?
What’s wrong?
What’s wrong?
Solution 1
Solution 2
Solution 3
What’s wrong?
None
Solution
Questions?
More Cool Features
Lambdas
Lambdas
Lambdas
Lambdas
Collections Why would I need anything besides an array?
Collections Anyone know what this is?
Collections Hack gives us the right tool for each job
Collections Cleaner API
Collections Other nice features • Familiar interface
Collections Other nice features • Familiar interface • OutOfBoundsException
Collections Other nice features • Familiar interface • OutOfBoundsException •
Collections are objects (no more passing by ref)
Collections Other nice features • Familiar interface • OutOfBoundsException •
Collections are objects (no more passing by ref) • Immutable collections too
Trailing Commas You know you want them
And more . . . • User attributes • Enhancements
to traits • Async / await • Constructor promotion • Shapes • Type aliases . . . .
Questions?
Why should you consider it? Safety Language Features (Developer) Speed
Trying out Hack is not scary • Gradual process
Trying out Hack is not scary • Gradual process •
Full PHP interoperability
Trying out Hack is not scary • Gradual process •
Full PHP interoperability • Not just for multi-million line codebases
Trying out Hack is not scary • Gradual process •
Full PHP interoperability • Not just for multi-million line codebases • Awesome tooling
How to get started • Install HHVM (packages available)
How to get started • Install HHVM (packages available) •
Convert existing code with hackificator
How to get started • Install HHVM (packages available) •
Convert existing code with hackificator • Monitor logs for type errors
How to get started • Install HHVM (packages available) •
Convert existing code with hackificator • Monitor logs for type errors • Harden your types over time
Resources • Conversion guide http://docs.hhvm.com/manual/en/install.hack.conversion.php • HHVM blog http://hhvm.com/blog •
IRC channel #hhvm • http://hhvm.com/frameworks/ • https://github.com/facebook/hhvm/wiki/Extensions
grumpy-learning.com
Questions? @jclermont https://joind.in/talk/view/14452
Feedback please @jclermont https://joind.in/talk/view/14452
Thank you! @jclermont https://joind.in/talk/view/14452