How to write/define method in javascript?

My instructor defines a class with the following:

function Stack () {
 var items = [];

getItems() {
  return items;
}

The question I have is how to define a method within the function Stack?

The exact instruction is as follows:

// 1. Implement the stack data structure described in the book. Instead of
// using let items = []; use var items = []. Note that this
// implementation does not use the prototype (see project).

function Stack() {
  
}

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

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