What did we learn last time?
How to ask a question to the staff
- Try yourself
- Google it
- StackOverflow it
- Create a reproducible bug (e.g. jsfiddle)
- Ask on slack (#general)
Random Questions
- What is let and why we need it?
- What is a linter
- It's Javascript Object Oriented?
Functions
- How do you create a function?
- How do you also create a function?
- And how do you also also create a function?
Variable scope
- Closures
- The module pattern
Variable hoisting
- A variable can be referenced before it was defined
undefined vs null
- undefined a variable hasn't been created or assigned
- null a variable was created and assigned to null
Objects
- It's an object the same thing than a java HashTable?
- How do you create a new object?
- Can you add new attributes after object creation?
Arrays
- Create a function that sorts an array
- Create a function that filters an array of objects
- Create a function sums all the items on an array
Modify the DOM
document.getElementById("myId").innerHTML = "<p> hello! </p>"
Exercise
Build a tweets page from the JSON file
Required Readings Next session
JavascriptJohn Alexis Guerra Gómezjguerra[at}northeastern.edu | @duto_guerraSlides:http://johnguerra.co/lectures/webDevelopment_fall2020/05_Javascript/Class page:http://johnguerra.co/classes/webDevelopment_spring_2020/
