#Generator arrow functions ?

#ECMAScript proposal: Generator Arrow Functions

Authors: Sergey Rubanov

Champion: Hemanth HM, Brendan Eich (?)

Stage: Stage 1 of the TC39 process.

#Motivation

Experience so far has been that people love arrow functions and generators and want a generator arrow. — Brendan Eich

Both arrow functions and generators are available since ES2015. Often people want to use generator arrow and this proposal (which was raised years ago) should solve their needs.

#Use cases

• 3 years old React example
• need more use-cases

#Possible solutions

Discussion of future syntax: https://github.com/tc39/proposal-generator-arrow-functions/issues/2

#Arrow function syntax

// Irregular
() =*> ...

// not the same order as in regular generator functions
() =>* ...

// also wrong order
() *=> ...

// ASI hazard
*() => ...

#Introduce new generator keyword for both function and arrow function

generator function() {}
const foo = async generator function() {};

class Foo {
  x = 1
  // No more ASI hazard!
  generator foo() {}
}

#TC39 meeting notes

• 20 November 2013
• 27 September 2016
• 29 September 2016

#Prior discussions

• https://esdiscuss.org/topic/why-do-generator-expressions-return-generators
• https://esdiscuss.org/topic/generator-arrow-functions

#Implementations

• none yet