Accessing Object information in Deno

Question

When using Deno 0.42.0, I find it difficult to do any type of analysis of objects by using typeof or other inspection techniques I use in JavaScript.

For example:

const form = new FormData();
console.log(`typeof: ${ typeof form }`);

.. just returns object

Similarly, inspecting properties like:

const form = new FormData();
console.log(`props: ${ Object.getOwnPropertyNames(form) }`);

... returns nothing.

At least instanceof does work:

const form = new FormData();
console.log(`props: ${ form instanceof FormData }`);

... returns true

Is there a way in Deno to inspect objects in real time without first knowing what the object type is?

Answer 1

It works exactly like that on the browser too.

typeof possible return values are:

• undefined
• object
• boolean
• number
• bigint
• string
• symbol
• function

So it's not possible for you to get another value.

---

Maybe what you want is .constructor.name

const form = new FormData();
console.log(`class: ${form.constructor.name}`); // FormData
console.log(`props: ${ form instanceof FormData }`); // true