Arrays and Loops Project

// 1.

// Without logging the values, list the value of `sports` and `total`

var sports = ['soccer', 'baseball'];

var total = sports.push('football', 'swimming');

// A:

// sports = 'soccer', 'baseball'

// total = 4

// 2.

// Using the `strings` array, wrte a function `longestString()`

// that accepts an array argument and returns the longest string in the array

var strings = ['this','is','a','collection','of','words'];

// A:

function longestString(inputArr){

var stringsLengths = [];

for(let i = 0; i < inputArr.length; ++i){

stringsLengths.push(inputArr[i].length);

}

var longestSeen = inputArr[0];

for(let p = 0; p < inputArr.length; p++){

if(longestSeen.length < inputArr[p].length){

longestSeen = inputArr[p];

}

}

return longestSeen;

}

console.log(longestString(strings));

//console.assert(longestString(strings) === 'collection', {"message": "longestString should return 'collection'"});

// Use the `numbers` array for questions 3 - 8.

var numbers = [1,12,4,18,9,7,11,3,101,5,6];

// 3.

// Write a function `smallestNumber()` that accepts an array

// and returns the smallest number in the array.

// A:

function smallestNumber(userInput){

userInput.sort(function(a,b){return a-b});

console.log(userInput[0]);

}

//console.assert(smallestNumber(numbers) === 1, {"message": "smallestNumber should return 1"});

// 4.

// Write a function `getEvens()` that accepts an array

// and returns only the even numbers in the array.

// A:

function getEvens(userInput){

var allEvens = [];

for(let p = 0; p < userInput.length; p++){

if(userInput[p] % 2 === 0){

allEvens.push(userInput[p]);

}

}

return allEvens;

}

//console.assert(getEvens(numbers).toString() === '12,4,18,6', {'message': 'getEvens should return "12,4,18,6"'});

// 5.

// Write a function that accepts an array argument

// and returns the array reversed

// Hint: When looping over the array, start at the last index

// and decrement the iterator to zero

// A:

function reversedArr(inputArr){

return inputArr.reverse();

}

//console.assert(arrayReverser(numbers).toString() === '6,5,101,3,11,7,9,18,4,12,1', {'message': 'arrayReverser should return "6,5,101,3,11,7,9,18,4,12,1"'});

// 6.

// Write a function that accepts an array argument

// and returns the sum of all of the numbers in the array

// A:

function sumAll(inputArr){

return inputArr.reduce(function(a,b){return a+b});

}

//console.assert(sumArrayOfNumbers(numbers) === 177, {'message': 'sumArrayOfNumbers should return 177'});

// 7.

// Write a function that accepts an array argument

// and returns an array of only the numbers greater than 10

// A:

function greaterThan10(inputArr){

var greaterThan10Arr = [];

for(let i = 0; i < inputArr.length; i++){

if(inputArr[i] > 10){

greaterThan10Arr.push(inputArr[i]);

}

}

return greaterThan10Arr;

}

//console.assert(numbersOver10(numbers).toString() === "12,18,11,101", {'message': 'numbersOver10 should return "12,18,11,101"'});

// 8.

// Write a function that accepts both an array and number argument

// and returns an array of only the numbers greater than the number passed to the function

// A:

function greaterThanN(inputArr, inputNum){

var greaterThan10nArr = [];

for(let i = 0; i < inputArr.length; i++){

if(inputArr[i] > inputNum){

greaterThan10nArr.push(inputArr[i]);

}

}

return greaterThan10nArr;

}

//console.assert(numbersOverX(numbers, 15).toString() === "18,101", {'message': 'numbersOverX should return "18,101"'});

// 9.

// Write a function `joinArrays()` that takes an array of arrays,

// and returns a single array with the contents of the second array

// listed after the contents of the first array

var numbers = [1,12,4,18,9,7,11,3,101,5,6];

var numbersTwo = [33,56,72,2,5,66,90,21,42];

// A:

function joinArrays(inputArr1, inputArr2){

var joinedArr = inputArr1.concat(inputArr2);

return joinedArr;

}

//console.assert(joinArrays([numbers, numbersTwo]).toString() === '1,12,4,18,9,7,11,3,101,5,6,33,56,72,2,5,66,90,21,42', {'message': 'joinArrays should return "1,12,4,18,9,7,11,3,101,5,6,33,56,72,2,5,66,90,21,42"'});

// 10.

// Using the `instructors` array, comment the value of each variable below

var instructors = [

['JD','JavaScript'],

['Tim','JavaScript'],

['Brit','Ruby'],

['Joe','iOS'],

['Dan','JavaScript'],

['Will','JavaScript'],

['Calvin','JavaScript'],

['James','Ruby']

];

var instructorNameDiscipline = instructors[5];

// greenvIlleInstructor = 'Will','JavaScript'

var instructorOne = instructors[4][0];

// instructorOne = 'Dan'

var instructorTwo = instructors[0][1];

// instructorTwo = 'JavaScript'

var instructorThree = instructors[2][0];

// instructorThree = 'Brit'