Array

<aside> 👀 Recording 27mins

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• What is an array?
• Why arrays and what can you do with them?
• How do you declare an array?
• How do you access items in an array?
• How do you work with arrays?

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1. Define an array of 5 items that are all numbers
2. Add one number at the end of the array
3. Add another number at the beginning of the array
4. Print out how many items you have in your array
5. Remove the items you just added at the beginning and at the end
6. Again print out how many items you have in your array with .length
7. Use the for loop to print out the items in your array
8. Use the for..of loop to print out the items in your array
9. Use the .toString() method to print out the items of your array
10. Use the .join() method to print out the items in your array using ; as a separator
11. (Bonus) Check if an item exists in your array with .includes()

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<aside> ✏️ *What is this code going to show? `let fruits = ["Apples", "Pear", "Orange"];

// push a new value into the "copy" let shoppingCart = fruits; shoppingCart.push("Banana");

// what's in fruits? alert( fruits.length ); // ?`*

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Object

<aside> 👀 Recording 33mins

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• What is object? Why do you need it?
• How to create Object?
• key:value
• How to access object's properties?
• How to add/remove properties?

<aside> 🧠 Can you make an array of your classmates? Imagine each classmate is an Object 🤪 (write it down either on your notebook or on the computer)

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• Array of objects