Quiz

1. can we talk more about how to connect external files?

   Sure. We just use the script tag with the src attribute:

   
   <script src="mystuff.js"></script>
   
   

   Then put your JS code in the mystuff.js file
2. I would like to know more about when to connect JS to HTML with a separate file vs not.

   Great question! It's something I've gone back and forth on, even in this class.

   • putting JS in the HTML file is simpler and easier: fewer files to copy around, edit, etc. BUT
   • putting JS in a separate file allows VS Code to properly indent, syntax highlight, offer suggestions, etc.

   Lately, I feel like the second approach is usually better, so I only use the first when there is only a very small amount of JS.

3. I'd like to have more practice with anonymous functions.

   We'll do that today!

4. splice method for JS arrays—I'm confused about the description that says that splicing ""optionally removes/inserts some elements."

   It's not well worded. Essentially splice can be use to (1) insert some elements, (2) delete some elements, or (3) both.

   

5. what would the typeof operator be used for in context?

   If you have a heterogenous array (different types of things in it), you can use typeof to determine whether something is a string, number, object, etc.

6. What is the difference between an object in Java and JavaScript?

   Great question! Objects play two roles in JS: dictionaries and the building blocks of objects in the sense of OOP and Java.

   We won't be looking at OOP in this course; there just isn't room.

   You can check out OOP in JS from CS 204.

7. javaScript object literals

   These are just like Python dictionaries, except for the dot notation, which is a convenient shortcut when the property is known.

   In practice, we almost always know the property, so the shortcut becomes the normal thing, and

   The square brackets become the unusual thing.