JavaScript Arrays

Introduction

This lab provides an opportunity to practice defining, accessing and manipulating arrays.

Note: Feel free to reference the arrays lesson, collaborate, google, etc.

Setup & Instructions

Create a new JS repl on repl.it for these exercises.

Title your repl JS Array Lab.

Copy the exercises below into the repl's script.js file and code away!

Submitting

IF lab is a DELIVERABLE. When completed, ** Fork & Clone ** this reposiotry. Then add a solution.txt file to this repo and paste your solution code into it (copy/paste from your repl.it). Make a pull request after adding, committing, and pushing your code to your fork!

Exercise

/*
Exercise 1:
  - Define an empty array named foods
*/

// Exercise 1 has been completed for you...

const foods = [];

foods.push('pizza')
foods.push('cheeseburger')

console.log('Exercise 1 Result:\n', foods);

/*
Exercise 2:
  - Add the strings 'pizza' & 'cheeseburger' to the foods array such that 'pizza' comes before 'cheeseburger'.
*/

// Complete Exercise 2 below...


console.log('Exercise 2 Result:\n',  foods);

/*
Exercise 3:
  - Add the string 'taco' to the foods array so that 'taco' is the first food in the array.
*/

// Complete Exercise 3 below...

foods.unshift('taco')



console.log('Exercise 3 Result:\n', foods);

/*
Exercise 4:
  - Access the string 'pizza' (based upon its known position) in the foods array and assign to a variable named favFood.
*/

// Complete Exercise 4 below...

const favFood = [];
favFood.push(foods [1])


console.log('Exercise 4 Result:\n', favFood);

/*
Exercise 5:
  - Insert the string 'tofu' in the foods array between 'pizza' & 'cheeseburger'
*/

// Complete Exercise 5 below...

foods.splice(2,0,'tofu');


console.log('Exercise 5 Result:\n', foods);
/*
Exercise 6:
  - Replace the string 'pizza' in the foods array with the strings 'sushi' & 'cupcake'.
*/

// Complete Exercise 6 below...

foods.splice(1,1,'sushi','cupcakes')



console.log('Exercise 6 Result:\n', foods);

/*
Exercise 7:
  - Use the slice method on the foods array to create a new array containing 'sushi' & 'cupcake'.
  - Assign the new array to a variable named yummy.
*/

// Complete Exercise 7 below...

var yummy = foods.slice(1,3)

console.log('Exercise 7 Result:\n', yummy);

/*
Exercise 8:
  - Using the indexOf method on the foods array, assign the index of the 'tofu' string to a variable named soyIdx.
*/

// Complete Exercise 8 below...

var soyIdx = foods.indexOf('tofu')


console.log('Exercise 8 Result:\n', soyIdx);

/*
Exercise 9:
  - Assign to a variable named allFoods the result of joining the strings in the foods array such that the result is the following single string:
    'taco -> sushi -> cupcake -> tofu -> cheeseburger'
*/

// Complete Exercise 9 below...

var allFoods = foods.join()

console.log('Exercise 9 Result:\n', allFoods);

/*
Exercise 10:
  - Assign a boolean to a variable named hasSoup depending upon whether or not the foods array includes the string 'soup'.
*/

// Complete Exercise 10 below...

var hasSoup = Boolean('soup')

console.log('Exercise 10 Result:\n', hasSoup);

/*
Exercise 11:
  - Use the forEach method to iterate through the provided nums array and add each odd number to a new array named odds.
  - Hint: Initialize the odds variable to an empty array before the iteration.
*/

const nums = [100, 5, 23, 15, 21, 72, 9, 45, 66, 7, 81, 90];

// Complete Exercise 11 below...

let odds = [];
nums.forEach(element => { if(element % 2 != 0){ odds.push(element)}});

nums.forEach(findOdds);

function findOdds(num) {
   if (num % 2 === 1) {
       odds.push(num);
 }
}

// this is code that Bruno supplied to the class via git hub, I did not write it. I inputed it to try and understand it. Same with the remaining questions (12, 13, 14, 15)


// var odd = function isOdd(n) {
//   return isEven(Number(n) + 1);
// }

nums.forEach



console.log('Exercise 11 Result:\n', odds);

/*
Exercise 12:
  - Use the forEach method to iterate through the same nums array and add the number to arrays named fizz, buzz and/or fizzbuzz based upon the following:
  	- Add to the fizz array if the number is evenly divisible by 3.
  	- Add to the buzz array if the number is evenly divisible by 5.
  	- Add to the fizzbuzz array if the number is evenly divisible by 3 & 5.
*/

// Complete Exercise 12 below...

nums.forEach(fuzzbizz);

function fuzzbizz(num){
  if (num % 3 === 0 && num % 5 === 0) {
    fizzbuzz.push(num);
  } else if (num % 3 === 0) {
    fizz.push(num);
  } else if (num % 5 === 0) {
    buzz.push(num);
  }
}
nums.forEach(element => { if(element % 5 === 0 && element % 3 === 0){fizzbuzz.push(element)} 
else if(element % 5 === 0){buzz.push(element)} 
else if(element % 3 === 0){fizz.push(element)}});


console.log('Exercise 12 Results:');
console.log('  fizz:', fizz);
console.log('  buzz:', buzz);
console.log('  fizzbuzz:', fizzbuzz);

/*
Exercise 13:
  - Given the below numArrays array of arrays (two-dimensional array), assign the last nested array to a variable named numList.
  - Assume you don't know how many nested arrays numArrays contains.
*/

const numArrays = [
	[100, 5, 23],
	[15, 21, 72, 9],
	[45, 66],
	[7, 81, 90]
];

// Complete Exercise 13 below...



console.log('Exercise 13 Result:\n', numList);

/*
Exercise 14:
  - Given the above numArrays array, access the number 66 and assign to a variable named num.
*/

// Complete Exercise 14 below..

var num = numArrays.indexOf(66)


console.log('Exercise 14 Result:\n', num);

/*
Exercise 15:
  - Given the above numArrays array, use nested forEach methods to sum up all the numbers contained within numArrays and assign to a variable named total.
  - Hint: Be sure to declare and initialize the total variable before the iterations.
*/

// Complete Exercise 15 below...

// I am having a hard time with questions 11 through 15. Some seem to be connected to others. I saw that Taylor said we would be learning more about these new methods this week. 

console.log('Exercise 15 Result:\n', total);