JavaScript Public Class Fields

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In the past, to create a public class field we would have used this syntax, instantiating the field in the constructor:

class Counter {
  constructor() {
    this.count = 0
  }
}

The new class fields proposal, which you can use since Chrome 72 and Node 12, allows us to use this syntax:

class Counter {
  count = 0
}

Much simpler!