As it stands, I'd rather see operator overloading before custom operators. In order to have decent custom operators, you really have to take into account the whole grammar, and adding them in a way that's not a blatant tack on usually involves rethinking the entire grammar. In contrast, operator overloading only requires a rethink of the primitive object model, and only analogous to how `instanceof` had to change to accommodate `Symbol.hasInstance`.
On Fri, Feb 2, 2018, 07:07 kdex <[email protected]> wrote: > In ECMAScript's current state, infix operators would likely complicate > future > discussions of operator overloading. Before we tackle these problems, I > think > it's more convenient to have type annotations first. > > On Friday, February 2, 2018 12:55:17 PM CET Thomas Grainger wrote: > > I'm porting this from the TypeScript issue tracker, original from: > > https://github.com/Microsoft/TypeScript/issues/2319#issue-60851953 > > > > Since it's very unlikely that the extension methods will ever be > > implemented [in a call-site-rewrite > > manner](https://github.com/Microsoft/TypeScript/issues/9# > > issuecomment-74302592), > > please consider adding infix operators to enable writing in functional > > style similarly to what can be done in Haskell: > > > > Monoids > > > > ```js > > > > function '+' (left, right) { > > return left.concat(right); > > } > > > > [1, 2, 3] '+' [4, 5]; // [1, 2, 3, 4, 5] > > > > ``` > > > > Monads > > > > ```js > > function '>>=' (promise, bind) { > > return promise.then(bind); > > } > > $.get('/get') '>>=' x => $.post('/save', x + 1) > > ``` > > > > Functors > > > > ```js > > function '.' (inner, outer) { > > return function(value: a) : c { > > return outer(inner(value)) > > } > > } > > > > function f(x) { } > > function g(y) { } > > (f '.' g)(x); // z > > ``` > > > > > > > > Thomas Grainger_______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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