Code review

src/arrays.js

@@ -1,61 +1,76 @@
 const getNthElement = (index, array) => {
-  // your code here
+  while (index >= array.length) {
+    index -= array.length;
+  }
+  let answer = array[index];
+  return answer;
 };
 
 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
+  array.push(element);
 };
 
 const addToArray2 = (element, array) => {
-  // your code here
+  return (array2 = 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 => {
+    return String.toUpperCase();
+  });
 };
 
 const reverseWordsInArray = strings => {
-  // your code here
+  return strings.map(String => {
+    return String.split("")
+      .reverse()
+      .join("");
+  });
 };
 
 const onlyEven = numbers => {
-  // your code here
+  return numbers.filter(Number => {
+    return Number % 2 === 0;
+  });
 };
 
 const removeNthElement2 = (index, array) => {
-  // your code here
+  return array.filter((_, itemIndex) => itemIndex !== index);
 };
 
 const elementsStartingWithAVowel = strings => {
-  // your code here
+  return strings.filter(String => /^[aeiou]/i.test(String))
 };
 
 const removeSpaces = string => {
-  // your code here
+  return string.split(" ").join("");
 };
 
 const sumNumbers = numbers => {
-  // your code here
+  const sum = numbers.reduce((total, amount) => total + amount);
+  return sum;
 };
 
 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

@@ -1,62 +1,119 @@
 const negate = a => {
-  // your code here
+  if (a === true) {
+    return false;
+  } else {
+    return true
+  };
 };
 
 const both = (a, b) => {
-  // your code here
+  if (a === true && b === true) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const either = (a, b) => {
-  // your code here
+  if (a || b === true) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const none = (a, b) => {
-  // your code here
+  if (a === false && b === false) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const one = (a, b) => {
-  // your code here
+  if ((a === true && b === false) || (a === false && b === true)) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const truthiness = a => {
-  // your code here
+  return Boolean(a);
 };
 
 const isEqual = (a, b) => {
-  // your code here
+  if (a === b) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const isGreaterThan = (a, b) => {
-  // your code here
+  if (a > b) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const isLessThanOrEqualTo = (a, b) => {
-  // your code here
+  if (a <= b) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const isOdd = a => {
-  // your code here
+  if (a % 2 === 0) {
+    return false;
+  } else {
+    return true;
+  }
 };
 
 const isEven = a => {
-  // your code here
+  if (a % 2 === 0) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const isSquare = a => {
-  // your code here
+  if (Math.sqrt(a) % 1 === 0) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const startsWith = (char, string) => {
-  // your code here
+  if (string.charAt(0) === char) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const containsVowels = string => {
-  // your code here
-};
+  let vowels = ["a", "e", "i", "o", "u", "A", "E", "I", "O", "U"];
+  for (i = 0; i < vowels.length; i += 1) {
+    let trueResult = string.includes(vowels[i]);
+    if (trueResult === true) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
 
 const isLowerCase = string => {
-  // your code here
-};
+ return string === string.toLowerCase();
+}
 
 module.exports = {
   negate,

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 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 Math.trunc(a / b);
 };
 
 const remainder = (a, b) => {
-  // your code here
+  return a % b;
 };
 
 module.exports = {

src/objects.js

@@ -1,41 +1,58 @@
 const createPerson = (name, age) => {
-  // your code here
+  const People = {
+    name: name,
+    age: age
+  }
+  return People;
 };
 
 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
+  if (person.age > 65) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 const getAges = people => {
-  // your code here
+  return people.map(person => person.age);
 };
 
 const findByName = (name, people) => {
-  // your code here
-};
+  return people.find(persons => persons.name === name);
+}
 
 const findHondas = cars => {
-  // your code here
+  return cars.filter(car => car.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 talkingPerson = {
+    name: name,
+    age: age,
+    introduce: strangersName => { return `Hi ${strangersName}, my name is ${  name  } and I am ${  age }!`
+    }
+  };
+  return talkingPerson;
 };
 
 module.exports = {