Mahoud solution

src/arrays.js

@@ -1,61 +1,91 @@
 const getNthElement = (index, array) => {
-  // your code here
+
+  let arrayIndex = index;
+  let arrayLenght = array.length;
+  if (arrayIndex < arrayLenght) {
+     return array[arrayIndex];
+  } 
+    return Array[arrayLenght -(arrayIndex)];
+
 };
 
 const arrayToCSVString = array => {
   // your code here
+ return array.join(",")
+
 };
 
 const csvStringToArray = string => {
   // your code here
+  return string.split(",");
+
 };
 
 const addToArray = (element, array) => {
-  // your code here
+ array.push(element);
 };
 
 const addToArray2 = (element, array) => {
   // your code here
+  return array.concat(element);
 };
 
 const removeNthElement = (index, array) => {
   // your code here
+  return array.splice(index, 1);
 };
 
 const numbersToStrings = numbers => {
   // your code here
+
+  return numbers.toString().split(',')
 };
 
 const uppercaseWordsInArray = strings => {
   // your code here
+  return strings.map(name => name.toUpperCase());
 };
 
 const reverseWordsInArray = strings => {
   // your code here
+  return strings.map(item => item.split('').reverse().join(''));
+
+
 };
 
 const onlyEven = numbers => {
   // your code here
+  return numbers.filter(item => item % 2 === 0);
 };
 
 const removeNthElement2 = (index, array) => {
-  // your code here
-};
+ // your code here
 
+};
 const elementsStartingWithAVowel = strings => {
   // your code here
+  const vowels = ['a','e','i','o','u'];
+  return vowels.map(function(vowel) {
+    return strings.find(function(string) {
+      return string.toLowerCase().charAt(0) === vowel;
+    });
+  });
 };
 
 const removeSpaces = string => {
   // your code here
+  return string.replace(/\s+/g, '')
 };
 
 const sumNumbers = numbers => {
-  // your code here
+    // your code here
+  return numbers.reduce((acc, curr) => acc + curr);
 };
 
 const sortByLastLetter = strings => {
   // your code here
+
+  return strings.sort((a, b) => a.charCodeAt(a.length - 1) - b.charCodeAt(b.length - 1));
 };
 
 module.exports = {

src/booleans.js

@@ -1,61 +1,100 @@
+/* eslint-disable func-names */
 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
+  if (a || b || a) {
+    return true;
+  }
+  return false;
 };
 
 const truthiness = a => {
-  // your code here
+  // your code her
+  if (a) {
+    return true;
+  }
+  return false;
 };
 
 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
+  if (a % 2 !== 0) {
+    return true;
+  }
+  return false;
 };
 
 const isEven = a => {
   // your code here
+  if (a % 2 == 0) {
+    return true;
+    // eslint-disable-next-line no-else-return
+  } else {
+    return false;
+  }
 };
 
 const isSquare = a => {
   // your code here
+  return Math.sqrt(a) === Math.round(Math.sqrt(a));
 };
 
-const startsWith = (char, string) => {
+const startsWith = (string, char) => {
   // your code here
+  if (string.startsWith(char)) {
+    return true;
+  }
+  return false;
 };
 
-const containsVowels = string => {
-  // your code here
+const containsVowels = function(string) {
+ const vowels = ['a','e','i','o','u'];
+//  var stringLowercase = string.toLowerCase()
+ for(i = 0; i < vowels.length; i++){
+   if (vowels.includes(string.toLowerCase()[i])){
+      return true;
+   }
+  }
+  return false;
 };
 
 const isLowerCase = string => {
   // your code here
+  return string == string.toLowerCase() && string != string.toUpperCase();
 };
 
 module.exports = {
@@ -75,3 +114,8 @@ module.exports = {
   containsVowels,
   isLowerCase
 };
+
+// program to count the number of vowels in a string
+
+// defining vowels
+

src/numbers.js

@@ -1,57 +1,68 @@
 const add = (a, b) => {
   // your code here
+  return a + b;
 };
 
 const subtract = (a, b) => {
-  // your code here
+// your code here
+  return a - b;
 };
 
 const multiply = (a, b) => {
-  // your code here
+// your code here
+  return a * b;
 };
 
 const divide = (a, b) => {
-  // your code here
+// your code here
+  return a / b;
 };
 
 const power = (a, b) => {
-  // your code here
+// your code here
+  return a ** b;
 };
 
 const round = a => {
-  // your code here
+// your code here
+  return Math.round(a);
 };
 
 const roundUp = a => {
-  // your code here
+// your code here
+  return Math.ceil(a);
 };
 
 const roundDown = a => {
-  // your code here
+// your code here
+  return Math.floor(a);
 };
 
 const absolute = a => {
-  // your code here
+// your code here
+  return Math.abs(a);
 };
 
 const quotient = (a, b) => {
-  // your code here
+// your code here
+  return Math.trunc(a / b);
 };
 
 const remainder = (a, b) => {
-  // your code here
+// your code here
+  return a % b;
 };
 
 module.exports = {
-  add,
-  subtract,
-  multiply,
-  divide,
-  power,
-  round,
-  roundUp,
-  roundDown,
-  absolute,
-  quotient,
-  remainder
+add,
+subtract,
+multiply,
+divide,
+power,
+round,
+roundUp,
+roundDown,
+absolute,
+quotient,
+remainder
 };

src/objects.js

@@ -1,43 +1,59 @@
-const createPerson = (name, age) => {
-  // your code here
-};
+
+  function createPerson(name, age) {
+    // your code here
+
+    return {
+      name: name,
+      age: 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 people.map((ages)=> ages.age)
 };
 
 const findByName = (name, people) => {
   // your code here
+  return  people.find((item) => item.name === name)
 };
 
 const findHondas = cars => {
-  // your code here
+    // your code here
+  return cars.filter(manafac => manafac.manufacturer === "Honda");
 };
 
 const averageAge = people => {
-  // your code here
+  // eslint-disable-next-line func-names
+  return people.reduce((acc, curr) => acc + curr.age, 0) / people.length;
 };
 
 const createTalkingPerson = (name, age) => {
   // your code here
 };
-
+ 
 module.exports = {
   createPerson,
   getName,