Object-Oriented JavaScript — Boolean, Number, and String

Object-Oriented JavaScript — Boolean, Number, and String

JavaScript is partly an object-oriented language. To learn JavaScript, we got to learn the object-oriented parts of JavaScript. In this article, we’ll look at primitive wrappers.

JavaScript is partly an object-oriented language.

To learn JavaScript, we got to learn the object-oriented parts of JavaScript.

In this article, we’ll look at primitive wrappers.

Boolean

The Boolean can be used as a factory function or a constructor.

For instance, we can write:

const b = new Boolean();

and we get a boolean wrapper object returned.

We can convert it back to a primitive value with valueOf :

b.valueOf();

A better use of the Boolean function is to use it as a factory function.

For example, we can write:

Boolean("foo");

then we get true .

It’ll return true for anything truthy and false otherwise.

Boolean without new returns a primitive value.

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