javascript-basics

src/arrays.js

@@ -1,61 +1,64 @@
 const getNthElement = (index, array) => {
-  // your code here
+  return array[index % array.length];
 };
 
 const arrayToCSVString = array => {
-  // your code here
+  return array[index .join];
 };
 
 const csvStringToArray = string => {
-  // your code here
+  return string[index .split(',')]; 
 };
 
 const addToArray = (element, array) => {
-  // your code here
+  return array.push(element);
 };
 
 const addToArray2 = (element, array) => {
-  // your code here
+  return index + array.concat(element);
 };
 
 const removeNthElement = (index, array) => {
-  // your code here
+  array.splice(index, 1);
+  return array
 };
 
 const numbersToStrings = numbers => {
-  // your code here
+  numbers.map(number => Strings());
+  return numbers
 };
 
 const uppercaseWordsInArray = strings => {
-  // your code here
+  return strings.map(letters => letters.toUpperCase());
 };
 
 const reverseWordsInArray = strings => {
-  // your code here
+ return strings.maps(letters => letters.split("").reverse().join(""));
 };
 
-const onlyEven = numbers => {
-  // your code here
+const onlyEven = (numbers) => numbers.filter(number => number % 2 === 0);
 };
 
 const removeNthElement2 = (index, array) => {
-  // your code here
+  return array.filter((_, itemIndex) => itemIndex !== index);
 };
 
-const elementsStartingWithAVowel = strings => {
-  // your code here
+const elementsStartingWithAVowel = (strings) => {
+const vowels = ['a', 'e', 'i', 'o', 'u'];
+return
 };
 
 const removeSpaces = string => {
-  // your code here
+  return [index.strip()];
 };
 
-const sumNumbers = numbers => {
-  // your code here
-};
+const sumNumbers = (numbers) => numbers.reduce((total, number) => {
+  return total + number
+}, 0);
 
-const sortByLastLetter = strings => {
-  // your code here
+const sortByLastLetter = (strings) => {
+  const reverseString = (item) => item.split('').reverse().join('');
+  return strings.map(reverseString).sort().map(reverseString);
 };
 
 module.exports = {

src/booleans.js

@@ -1,61 +1,61 @@
 const negate = a => {
-  // your code here
+  return !a;
 };
 
 const both = (a, b) => {
-  // your code here
+  return a && b;
 };
 
 const either = (a, b) => {
-  // your code here
+  return a || b;
 };
 
 const none = (a, b) => {
-  // your code here
+  return !a && !b;
 };
 
 const one = (a, b) => {
-  // your code here
+  return (a || b) && !(a && b);
 };
 
 const truthiness = a => {
-  // your code here
+  return Boolean (a);
 };
 
 const isEqual = (a, b) => {
-  // your code here
+  return a === b;
 };
 
 const isGreaterThan = (a, b) => {
-  // your code here
+  return a > b;
 };
 
 const isLessThanOrEqualTo = (a, b) => {
-  // your code here
+  return a <= b;
 };
 
 const isOdd = a => {
-  // your code here
+  return (a % 2) === 1;
 };
 
 const isEven = a => {
-  // your code here
+  return (a % 2) === 2;
 };
 
 const isSquare = a => {
-  // your code here
+  return Boolean(Math.sqrt(a) % 1 === 0);
 };
 
 const startsWith = (char, string) => {
-  // your code here
+  return string.CharAt (0) === char;
 };
 
 const containsVowels = string => {
-  // your code here
+  return string
 };
 
 const isLowerCase = string => {
-  // your code here
+  return string === string.toLowerCase();
 };
 
 module.exports = {

src/numbers.js

@@ -1,45 +1,45 @@
 const add = (a, b) => {
-  // your code here
+  return a + b;
 };
 
 const subtract = (a, b) => {
-  // your code here
+  return a - b;
 };
 
 const multiply = (a, b) => {
-  // your code here
+  return a * b;
 };
 
 const divide = (a, b) => {
-  // your code here
+  return a / b;
 };
 
 const power = (a, b) => {
-  // your code here
+ return Math.pow(a,b);
 };
 
 const round = a => {
-  // your code here
+  return Math.round(a);
 };
 
 const roundUp = a => {
-  // your code here
+  return Math.ceil(a);
 };
 
 const roundDown = a => {
-  // your code here
+  return Math.floor(a);
 };
 
 const absolute = a => {
-  // your code here
+  return Math.abs(a);
 };
 
 const quotient = (a, b) => {
-  // your code here
+  return (a - (a % b)) / b;
 };
 
 const remainder = (a, b) => {
-  // your code here
+  return a % b;
 };
 
 module.exports = {

src/objects.js

@@ -1,41 +1,50 @@
 const createPerson = (name, age) => {
-  // your code here
+  name,
+  age,
+  createPerson, Function () 
+    return "name" + ' ,' + age
 };
 
 const getName = object => {
-  // your code here
+  return object.name;
 };
 
 const getProperty = (property, object) => {
-  // your code here
+  return object[property]
 };
 
 const hasProperty = (property, object) => {
-  // your code here
+  return object.hasOwnProperty(property)
 };
 
 const isOver65 = person => {
-  // your code here
+  return person.age > 65;
 };
 
 const getAges = people => {
-  // your code here
+  return getAges.find(.age);
 };
 
 const findByName = (name, people) => {
-  // your code here
+  return people.find(object => object.name === name);
 };
 
 const findHondas = cars => {
-  // your code here
+  return cars.filter(object => object.manufacturer === "Honda"); 
 };
 
 const averageAge = people => {
-  // your code here
+const totalAge = people.reduce((prevAge, currentPerson) => {
+  return prevAge + currentPerson.age;
+  }, 0);
+  return totalAge / people.length;
 };
 
-const createTalkingPerson = (name, age) => {
-  // your code here
+const createTalkingPerson = (name, age) => ({
+  name,
+  age,
+  introduce: (introduce) => `Hi ${introduce}, my name is ${name} and I am ${age}!`
+})
 };
 
 module.exports = {

src/strings.js

@@ -1,25 +1,25 @@
-const sayHello = string => {
-  // your code here
+const sayHello = (string) => {
+  return ("Hello, " + string + "!");
 };
-
+ 
 const uppercase = string => {
-  // your code here
+  return string.toUpperCase();
 };
 
 const lowercase = string => {
-  // your code here
+  return string.toLowerCase();
 };
 
 const countCharacters = string => {
-  // your code here
+   return string.length;
 };
 
 const firstCharacter = string => {
-  // your code here
+  return string.charAt();
 };
 
 const firstCharacters = (string, n) => {
-  // your code here
+  return string.slice(0,n);
 };
 
 module.exports = {