JavaScript: new

The new operator creates an object instance by calling a constructor.

What you will learn

How new calls a constructor and creates an instance
How to create built-in objects and instances of your own class
How new differs from calling an ordinary function

Built-in objects

const myDate = new Date();
const myRegExp = new RegExp("^web");

console.log(myDate);
console.log(myRegExp.test("web programming"));

JavaScript creates a new object and returns it to the variable. The constructor can use its arguments to set the initial state.

Custom classes

class Player {
  constructor(name) {
    this.name = name;
  }
}

const hero = new Player("Yuki");
console.log(hero.name);

new Player("Yuki") creates an instance and runs the class constructor. For ordinary boolean values, prefer true or false over new Boolean(), because wrapper objects can be confusing.