Optional Curly Braces in JavaScript

Ron Buckton Ron.Buckton at microsoft.com
Sun Nov 3 19:12:23 UTC 2019

The '_' isn't necessary for chaining expressions, as ',' would already suffice:

if (foo==2)

Also, '_' is already a valid expression/identifier.

While I'm not generally a fan of eliding braces from everything, I have expressed interest in evaluating something like C#'s expression-bodied methods for ECMAScript:

class C extends B {
  constructor(arg) => super(arg, true);
  toString() => `prop: ${this.prop}`;
  get prop() => this.x + this.y;

From: es-discuss <es-discuss-bounces at mozilla.org> on behalf of Ed Saleh <medozs at outlook.com>
Sent: Sunday, November 3, 2019 10:48:12 AM
To: Sanford Whiteman <swhitemanlistens-software at figureone.com>; es-discuss <es-discuss at mozilla.org>
Subject: Re: Optional Curly Braces in JavaScript

Update to the proposal:

Since we can't make spaces in JavaScript, the best we can do is use '_' instead.
We will also git rid of ':' after statement in the old version as '_' is enough indication and it's more compatible with our current curly braces syntax.

Final result:

if (foo==2) _
bar() _

Which is the same as:
if (foo==2)
_ bar();
_ bar2();

Basically `_` would allow chaining expressions inside a statement block.

Thank you,
From: es-discuss <es-discuss-bounces at mozilla.org> on behalf of Sanford Whiteman <swhitemanlistens-software at figureone.com>
Sent: Sunday, November 3, 2019 1:36:36 AM
To: es-discuss <es-discuss at mozilla.org>
Subject: Re: Optional Curly Braces in JavaScript

> the only thing really missing (and which python has) is a builtin
> wasm-sqlite3 library (and specialized/secure file-api's to persist
> sqlite-db-blobs).

Browsers (WPWG, not this group) tried WebSQL. It failed because there
wasn't a competitive bake-off with any other implementations _besides_

If a browser vendor had used another engine, then SQLite might've won
the bake-off and now you'd have what you describe.

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