Constructor concept in javascript

Question

In one of my questions, I got the following code as one of the answers. My understanding of the language has come has come a far better now, just have one small question.

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Answer 1

There are a few ways to define Javascript classes and invoke them with a constructor. But remember that JavaScript is actually classless.

1. Use a function
2. The use of Object literals
3. A singleton using a function

An excellent article about it can be found here: 3 ways to define a Javascript class