Code review

src/arrays.js

@@ -1,61 +1,79 @@
+const array = ['cat', 'dog', 'elephant', 'fox'];
 const getNthElement = (index, array) => {
-  // your code here
+  return array[index % array.length];
 };
 
+
 const arrayToCSVString = array => {
   // your code here
+  return array.toString();
 };
 
 const csvStringToArray = string => {
   // your code here
+  return string.split(',');
 };
 
 const addToArray = (element, array) => {
   // your code here
+  console.log(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.map(String);
 };
 
 const uppercaseWordsInArray = strings => {
   // your code here
+  return strings.map(string => string.toUpperCase());
 };
 
 const reverseWordsInArray = strings => {
   // your code here
+  return strings.map(string => string.split('').reverse().join(''));
 };
 
 const onlyEven = numbers => {
   // your code here
+  return numbers.filter(x => x % 2 === 0);
 };
 
 const removeNthElement2 = (index, array) => {
   // your code here
-};
+  const newArray = [...array];
+  newArray.splice(index, 1);
+  return newArray;
+}
 
 const elementsStartingWithAVowel = strings => {
   // your code here
-};
+  return strings.filter(string => (string.match(/^[aeiou]/gi)));
+}
 
 const removeSpaces = string => {
   // your code here
+  return string.replace(/\s+/g, '');
 };
 
 const sumNumbers = numbers => {
   // your code here
+  return numbers.reduce((total, current) => total + current, 0)
 };
 
 const sortByLastLetter = strings => {
   // your code here
+  return strings.sort((x, y) => x.charCodeAt(x.length - 1) - y.charCodeAt(y.length - 1));
 };
 
 module.exports = {

src/booleans.js

@@ -1,62 +1,98 @@
-function negate(a) {
-  // your code here
-};
+const negate = (a) => !a;
 
-function both(a, b) {
-  // your code here
-};
+const both = (a, b) => {
+  if (!a || !b) {
+    return false;
+  }
+  return true;
+}
 
-function either(a, b) {
-  // your code here
-};
+const either = (a, b) => {
+  if (a || b) {
+    return true;
+  }
+  return false;
+}
+const none = (a, b) => {
+  if (a || b) {
+    return false;
+  }
+  return true;
+}
 
-function none(a, b) {
-  // your code here
-};
+const one = (a, b) => {
+  if ((a && !b) || (b && !a)) {
+    return true;
+  }
+  return false;
+}
 
-function one(a, b) {
-  // your code here
-};
+const truthiness = (a) => {
+  if(a){
+    return true;
+  }
+    return false;
+  }
 
-function truthiness(a) {
-  // your code here
-};
+const isEqual = (a, b) => {
+  if (a === b){
+    return true;
+  }
+    return false;
+  }
 
-function isEqual(a, b) {
-  // your code here
-};
 
-function isGreaterThan(a, b) {
-  // your code here
-};
+const isGreaterThan = (a, b) => {
+  if (a > b){
+    return true;
+  }
+    return false;
+  }
 
-function isLessThanOrEqualTo(a, b) {
-  // your code here
-};
+const isLessThanOrEqualTo = (a, b) => {
+  if (a <= b){
+    return true;
+  }
+    return false;
+  }
 
-function isOdd(a) {
-  // your code here
-};
+const isOdd = (a) => {
+  if (a % 2 === 1){
+    return true;
+  }
+    return false;
+  }
 
-function isEven(a) {
-  // your code here
-};
+const isEven = (a) => {
+  if (a % 2 === 0){
+    return true;
+  }
+    return false;
+  }
 
-function isSquare(a) {
-  // your code here
-};
+const isSquare = (a) => {
+  if (Math.sqrt(a) % 1 === 0){
+    return true;
+  }
+    return false;
+  }
 
-function startsWith(char, string) {
-  // your code here
-};
+const startsWith = (char, string) => {
+  if (string.startsWith(char) === true){
+    return true;
+  }
+    return false;
+  }
 
-function containsVowels(string) {
-  // your code here
-};
 
-function isLowerCase(string) {
-  // your code here
-};
+const containsVowels = (string) => /[aeiou]/gi.test(string);
+
+const isLowerCase = (string) => {
+  if (string === string.toLowerCase()){
+    return true;
+  }
+    return false;
+  }
 
 module.exports = {
   negate,

src/numbers.js

@@ -1,57 +1,35 @@
-function add (a, b) {
-  // your code here
-}
+const add = (a, b) => a + b;
 
-function subtract (a, b) {
-  // your code here
-}
+const subtract = (a, b) => a - b;
 
-function multiply (a, b) {
-  // your code here
-}
+const multiply = (a, b) => a * b;
 
-function divide (a, b) {
-  // your code here
-}
+const divide = (a, b) => a / b;
 
-function power (a, b) {
-  // your code here
-}
+const power = (a, b) => a ** b;
 
-function round (a) {
-  // your code here
-}
+const round = (a) => Math.round(a);
 
-function roundUp (a) {
-  // your code here
-}
+const roundUp = (a) => Math.ceil(a);
 
-function roundDown (a) {
-  // your code here
-}
+const roundDown = (a) => Math.floor(a);
 
-function absolute (a) {
-  // your code here
-}
+const absolute = (a) => Math.abs(a);
 
-function quotient (a, b) {
-  // your code here
-}
+const quotient = (a, b) => Math.trunc(a / b);
 
-function remainder (a, b) {
-  // your code here
-}
+const remainder = (a, b) => 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

@@ -1,41 +1,59 @@
 const createPerson = (name, age) => {
   // your code here
+  this.name = name;
+  this.age = age;
+  return this;
 };
 
 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[property]? true : false;
 };
 
 const isOver65 = person => {
   // your code here
+  return person.age > 65? true : false;
 };
 
 const getAges = people => {
   // your code here
+  return people.map(ageArray => ageArray.age);
 };
 
 const findByName = (name, people) => {
   // your code here
+  return people.find(person => person.name === name);
 };
 
 const findHondas = cars => {
   // your code here
+  return cars.filter(carModel => carModel.manufacturer === 'Honda');
 };
 
 const averageAge = people => {
   // your code here
+  return people.reduce((a,b) => a + b.age, 0) / people.length;
 };
 
 const createTalkingPerson = (name, age) => {
   // your code here
+  return {
+    name: name,
+    age: age,
+    introduce: stranger => {
+      return `Hi ${stranger}, my name is ${name} and I am ${age}!`;
+    }
+    };
 };
 
 module.exports = {