ES.nextNews: the latest in JavaScript and cross-platform tools
Curated by Dr. Axel Rauschmayer and Johannes Weber. News

The latest in JavaScript and cross-platform tools

Dear readers!

We are taking a mid-year break and will be back on September 13. Have a great July and August!

Jowe & Axel

Ecma International approves ECMAScript 2022: What’s new?
New features in ECMAScript 2022:
  • New members of classes:
    • Properties (public slots) can now be created via instance public fields and static public fields.
    • Private slots are new and can be created via:
      • Private fields (instance private fields and static private fields)
      • Private methods and accessors (non-static and static)
    • Static initialization blocks
  • Private slot checks via in
  • Top-level await in modules
  • error.cause
  • Method .at() of indexable values (strings, Arrays, TypedArrays)
  • RegExp match indices
  • Object.hasOwn(obj, propKey)

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In defense of blocks for local scopes
Kyle Simpson argues in favor of using block statements to give a sequence of statements its own scope.

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You don’t need void 0 in JavaScript, @p42ai
In JavaScript code, especially if it’s older, you may have seen void 0 being used as an alternative to undefined. This blog post explains:
  • Why void 0 is an alternative to undefined.
  • Why avoiding undefined made sense before ECMAScript 6.
  • Why that’s not necessary anymore.

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