EcmaScript Proposal – Private methods and fields proposals.

[Sultan]

[Strawman] Private methods and fields for JavaScript: https://github.
com/thysultan/proposal-private-methods-and-fields

```js

class A {
  private id = Symbol('unique')
  equal(instance, property) {
    return private(this)[property] == private(instance)[property]
  }
}

const x = new A()

x.equal(x, 'id')

```
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