Updates from 82nd meeting of TC39

There were several items in the agenda, this post mainly focuses on feature proposals.

Stage 4:

• Class Fields:

Private instance methods and accessors
Class Public Instance Fields & Private Instance Fields
Static class fields and private static methods

Stage 3:

• Intl Locale Info API part of ECMA402: A proposal to expose Locale information, such as week data (first day in a week, weekend start day, weekend end day, minimun day in the first week), and text direction hour cycle used in the locale.

Stage 2:

• Extend TimeZoneName Option Proposal part of ECMA402: Extend the timeZoneName option in Intl.DateTimeFormat object to support more formatted options.

• Accessible Object.prototype.hasOwnProperty(): Proposal for an Object.hasOwn() method to make Object.prototype.hasOwnProperty() more accessible.

• Symbols as WeakMap keys: This proposal extends the WeakMap API to allow usage of unique Symbols as keys.

Stage 1:

• Change Array by copy: Provides additional methods to Array.prototype to enable changes on an array by returning a new copy of it with the change.

• proposal-readonly-arraybuffer +
  proposal-arraybuffer-fixed-view shall be combined to one single proposal.

Bonus update:

The (stage 1) Pattern Matching proposal has been updated, don't miss to read this!