ECMAScript & TC39

I'd love to change the world...

History time!

What is already finished?

ES2015 / ES6

```
Array.prototype.includes
```
```
Exponential operator (**)
```

ES2016 / ES7

```
Object.getOwnPropertyDescriptors
```
```
Object.{entries,values}
```
```
Shared memory and atomics
```
```
String.prototype.pad{End/Start}
```
```
Trailing commas (args and calls)
```
```
async / await
```

ES2017 / ES8

Asynchronous iteration
Promise.prototype.finally
RegExp: lookbehinds
RegExp: named capture groups
RegExp: s flag
RegExp: unicode property escapes
Rest and spread (...)
Tagged template literals change

ES2018 / ES9

```
Array.prototype.flat{,Map}
```
```
Function.prototype.toString revison
```
```
JSON superset
```
```
JSON.stringify revision
```
```
Object.fromEntries
```
```
Optional catch binding
```
```
String.prototype.trim{End,Start}
```
```
Symbol.prototype.description
```

The Process

Nearest future!

Not sure though.

Stage 3

```
BigInt
```
```
Hashbang Grammar
```
```
Legacy RegExp features
```
```
Private accessors
```
```
Private methods and fields
```
```
Static fields
```
```
String.prototype.matchAll
```
```
globalThis
```
```
import()
```
```
import.meta
```

Stage 2

```
ArrayBuffer.prototype.transfer
```
```
Atomics.waitAsync
```
```
Collection normalization
```
```
Decorators
```

Function.prototype.toString() censorship

```
New Set methods
```
```
Numeric separators
```
```
Promise.allSettled
```
```
Realms
```
```
RegExp Match array offsets
```

Sequence properties in Unicode property escapes

```
Temporal
```
```
Top-level await
```
```
WeakRefs
```
```
function.sent metaproperty
```
```
throw expressions
```

Stage 1

48 proposals

Stage 0

21 proposals

ECMAScript & TC39

By Radosław Miernik

ECMAScript & TC39

Vazco TechMeeting 2019-03-12

909

Radosław Miernik

Open source? Embrace, understand, develop.

radekmie.dev