5_ArraysObjectsExercise.js

// Week 3 - Arrays and Objects

// In the following exercises, you will need to place your code or answer underneath each
// exercise prompt.

// First try answering these without using references or looking up any information.
// Then, check your answer by using references and/or running your code.
// You can run your JS code using the Chrome or Firefox Developer tools, or by using Node.js.
// Feel free to update your answers if you got them wrong at first -- this exercise is for your own learning.
// But make sure you understand why the correct answer is right.

// Exercise 1. Make an empty array named animals
let emptyAnimalArr = [];

// Exercise 2. Add the string "frog" to the array
emptyAnimalArr = ["frog"];

// Exercise 3. Add 4 more animals of your choice to the array. Try to add all of them in one line of code.
emptyAnimalArr = ["frog", "bear", "monkey", "cat", "butterfly"];

// Exercise 4. Update the first item in the array to be "gorilla"
emptyAnimalArr[0] = "gorilla";

// Exercise 5. Print the number of items in the array (use the array property that will give you this information)
console.log(emptyAnimalArr.length)

// Exercise 6. Print the first item in the array
console.log(emptyAnimalArr[0]);

// Exercise 7. Print the last item in the array (as part of your answer, use the same array property you used in exercise 5 above)
console.log(emptyAnimalArr[emptyAnimalArr.length - 1]);

// Exercise 8. Remove the last item from the array
emptyAnimalArr.pop();

// Exercise 9. Now make a new array named assortedThings that contains at least 3 strings and 3 numbers.
let assortedThings = ["Gracie Abrams", "Let It Happen", "Free Now", 26, 13, 212]

// Exercise 10. Write a for loop that iterates through the assortedThings array and prints each index and item, such as:
// Item #0 is potato
// Item #1 is 4
// Item #2 is Hello World
// ...
for (let i = 0; i < assortedThings.length; i++){
  let itemsInArr = assortedThings[i];
  console.log(`Item ${i} is ${itemsInArr}`)
}
// Exercise 11. Write a function that takes an array of numbers as a parameter. For each number in the array,
// print the number and "BIG" if it's over 100, "small" if it's between 0 and 100, and "negative" if
// it's less than 0. Example:
// if the array is [-2, 200, 50], print:
// -2 negative
// 200 BIG
// 50 small
//
// Then write some function calls you would use to test your function.

function numInArr(arr){
  for (number of arr){
    if (number > 100){
      console.log(`${number} BIG`); 
    } else if (number >= 0 && number <= 100){
      console.log(`${number} small`);
    } else if (number < 0){
      console.log(`${number} negative`);
    }
  }
}

console.log(numInArr([-4, 10, 100]));
console.log(numInArr([55, -10, 200]));

// Exercise 12. Make an object called me that contains the following keys: name, favoriteAnimal, favoriteNumber
// The values of those keys can be whatever you choose.

const randomObj = {
  name: "Carol",
  favoriteAnimal: "Deer",
  favoriteNumber: 13
}
// Exercise 13. Add another 2 keys and values to the object (you choose what they are)

randomObj.favoritePlace; 
randomObj.favoriteFood; 
randomObj.favoriteFood = "Pumpkin"; 
randomObj.favoritePlace = "Idaho"; 

// Exercise 14. Update the favoriteAnimal value to something different
randomObj.favoriteAnimal = "Pig";

// Exercise 15. Print the value of favoriteAnimal.
console.log(randomObj.favoriteAnimal);
console.log(randomObj["favoriteAnimal"]);

// Note: there are at least 2 ways to get the value of a key, try to write both.

// Congrats, you made it to the end!
// Did you find this easy or hard? If you used references, which ones helped you?
// Please answer in a comment below.
//

// Email your file to the course staff,
// or commit your file to GitHub and email us a link.