Sure, but I'm first curious about classes because in my example, the
code is all defined _inside_ a class definition's lexical scope, where
private fields (or keys) are _currently_ defined to exist, so it seems
like an approach we can currently take.
Private fields on objects without classes being in play would be neat too!
#!/JoePea
On Sun, Aug 9, 2020 at 7:55 PM Michael Theriot
<michael.lee.ther...@gmail.com> wrote:
>
> Why stop at class definitions?
>
> e.g.
> ```js
> let obj;
> {
> let local = 0;
> obj = {
> get local() {
> return local;
> }
> }
> }
> ```
>
> becomes
> ```js
> const obj = {
> #local: 0,
> get local() {
> return this.#local;
> }
> }
> ```
>
> On Fri, Aug 7, 2020 at 3:33 PM #!/JoePea <j...@trusktr.io> wrote:
>>
>> Not sure if the following is exactly how we'd want it to be, but it
>> would be useful:
>>
>> ```js
>> class Foo {
>> // calculatedValue is intended to have read-only properties
>> calculatedValue = {
>> #x: 0,
>> get x() { return this.#x },
>> #y: 0,
>> get y() { return this.#y },
>> #z: 0,
>> get z() { return this.#z },
>> }
>>
>> update() {
>> this.calculatedValue.#x = 42 // ok
>> this.calculatedValue.#y = 42 // ok
>> this.calculatedValue.#z = 42 // ok
>> }
>> }
>> ```
>>
>> End user:
>>
>> ```js
>> const foo = new Foo
>> foo.calculatedValue.x // ok
>> foo.calculatedValue.#x // syntax error
>> ```
>>
>> We could currently do something like this:
>>
>> ```js
>> class Foo {
>> #calcX = 0
>> #calcY = 0
>> #calcZ = 0
>>
>> // calculatedValue is intended to have read-only properties
>> calculatedValue = (() => {
>> const self = this
>> return {
>> get x() { return self.#calcX },
>> get y() { return self.#calcY },
>> get z() { return self.#calcZ },
>> }
>> })()
>>
>> update() {
>> this.#calcX = 42 // ok
>> this.#calcY = 42 // ok
>> this.#calcZ = 42 // ok
>> }
>> }
>> ```
>>
>> Any plans for something like this? Is there a plan for private fields
>> for object literals? If so, maybe that can somehow tie into usage
>> within class bodies with WeakMap-ish semantics.
>>
>> #!/JoePea
>> _______________________________________________
>> es-discuss mailing list
>> es-discuss@mozilla.org
>> https://mail.mozilla.org/listinfo/es-discuss
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