Yes I like syntactic sugar when it doesn't sacrifice clarity (e.g. class,
arrow functions).
However, I do like the logical assignment operator pointed out by Jordan
somewhat more than the "conditional assign" ("if not assigned") idea at the
beginning of this thread. My reason is that you cannot "reset" a variable
to a "not assigned" state to re-use the "conditional assign" operator,
whereas you can reset a variable to a nullish or falsy state and re-use the
logical assignment operator, e.g.
x ||= 5;
x = null; //this works as a reset!
x ?= 5;
x = undefined; //this doesn't work as a reset! Apparently nothing will
However, maybe non-resettability is a desired feature of the conditional
assign operator idea, so maybe it should be an additional feature, albeit
with different syntax
On Mon, 13 Apr 2020 at 18:02, Bergi <a.d.be...@web.de> wrote:
> Hi!
>
> > What I've long wanted is an assignment operator which evaluates to the
> > pre-assignment value of the LHS.
> > You know, sort of like `a++` evaluates to the pre-incremented value of
> `a`.
>
> Given the amount of confusion that the difference between `++a`, `a++`
> (and `a += 1`) already has caused, I doubt that would be a good idea.
> In most, if not all, cases the desired behaviour can be easier and
> cleaner expressed with two statements, and a temporary variable if
> absolutely necessary.
>
> > ```
> > let a = 1;
> > console.log(a =^= 2); // logs 1 and then sets a to 2
> > ```
>
> would be just
> ```
> let a = 1;
> console.log(a)
> a = 2;
> ```
>
> kind regards,
> Bergi
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> https://mail.mozilla.org/listinfo/es-discuss
>
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