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beyondand
ES2015
ES.next ?
harmony ?
ES6 ?
ES2015 ?
ES2015July 2011 - June 2015
New features• classes • arrows • enhanced object literals • template strings • destructuring • default + rest + spread • let + const • iterators + for..of • generators • unicode • modules • module loaders • map + set + weakmap + weakset • proxies • symbols • subclassable built-ins • promises • math + number + string + array + object APIs • binary and octal literals • reflect api • tail calls
Jay PhelpsSenior Front end engineer | Netflix Twitter: @_jayphelps
Block ScopeInstead of Function Scope
Before
after
constants
Chrome 41
Browser Support
EDGE 12
Safari nope
Firefox 44
Destructuring
Before
after
Swapping variables
Destructuring parameters
Destructuring parameters
Chrome 45
Browser Support
EDGE 13
Safari nope
Firefox 22
Arrow Functions
Before
after
lexical `this`
lexical `this`references parent scope `this`
lexical `arguments`references parent scope `arguments`
Chrome 45
Browser Support
EDGE 13
Safari nope
Firefox 22
classes
Before
after
syntactic sugarstill uses Prototype-based inheritance
Must use `new`
Must use `new`
classes are not hoistedUnlike function declarations
classes are not hoistedUnlike function declarations
classes are not hoistedUnlike function declarations
class expressionsSimilar to Function Expressions
Must call `super`before accessing `this`When you extend, your constructor
Inheritance
Inheritance
Inheritance
Inheritance
extend built-ins
only works with native es2015 supportextending build-ins
not with transpilers alone
Chrome coming soon in 49
Browser Support
EDGE 13 behind a flag
Safari basic support in 7.1, full support 9
Firefox basic support in 2 (yes, two!), full support 34
How can I play today?i.e. I have to support Internet Explorer
Use a transpiler
Lets gossip
rumored features… es2017++ ?!
Disclaimer:
EnumsAxel Rauschmayer
https://gist.github.com/rauschma/f3e77132319e09b94722
Pattern Matching !!!Yehuda katz
pattern matching !!!
https://github.com/natefaubion/sparklerSimilar syntax of
Optional type annotations like Flow or TypeScript
Macros like sweet.js
Bonus guesses
your voice mattersi.e. bug the tc39 members
Twitter: @_jayphelpsThat’s all folks
