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Private members in ES6 classes

"Let's create an ES6 class!" you say. "Let's give it a private variable x."

class Foo {
  constructor(x) {
    this.x = x;
  }
  getX() {

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	// === Arrays

	var [a, b] = [1, 2];
	console.log(a, b);
	//=> 1 2


	// Use from functions, only select from pattern
	var foo = () => [1, 2, 3];