basics.js

// This is a general practice file for JavaScript Basics. Please follow the instructions thoughout the sheet. Do not uncomment the commented out spaces.
// var arr, findTwo, pusher, upFront, remover, copyCat, chopIt, sumIt, evenOdd, timesTen, animal, findAge, getKeys, changeName, speechMaker, addKey, keyLoop, cars, findModels
//
// // Arrays
//
// // 1. Create the variable arr and assign it an array with the following list of numbers 12, 42, 36, 51, 96
var arr = [12, 42, 36,51,96];
// // 2. Create a function called findTwo that takes in the arr array and returns the value at index 2.
function findTwo(arr) {
  return arr[2]
}
// 3. Create a function called pusher that takes in an array and a number and positions the number at the end of the array. Return the new array.
function pusher(arr, num) {
  var newArr = arr;
  newArr.push(num);
  return newArr;
}
// 4. Create a function called upFront that takes in an array and a number and positions the number in beginning of the array. Return the new array.
function upFront(arr, num) {
  var newArr = arr;
  newArr.unshift(num)
  return newArr;
}
// 5. Create a function called remover that takes in an array and removes the value at the end of the array. Return the new array.
function remover(arr) {
  var newArr = arr;
  newArr.pop()
  return newArr
}
// 6. Create a function called copyCat that takes in an array, copies, and returns the second and third index values.
function copyCat(arr){
  var secondThird = arr.slice(2,4)
  return secondThird;
}
// 7. Create a function called chopIt that takes in an array and two numbers. It deletes the original 3rd index value and inserts the two numbers in it's place.
function chopIt(arr, num1, num2) {
   var newArr = arr;
   newArr.splice(3, 1, num1, num2);
   return newArr;
}
// 8. Create a function called sumIt that takes in the array and returns the sum of each of the values in the array.
function sumIt(arr) {
  var sum = arr.reduce(function(acc, val) {
  return acc + val;
}, 0);
  return sum;
}
// 9. Create a function called evenOdd that takes in the array and pushes into a new array "even" or "odd" for every value in the array, depending upon whether they are even or odd number values. Return the new array.
// Hint: Use the modulus operator
function evenOdd(arr) {
  var oddAndEven = [];
  for(var i = 0; i < arr.length; i++) {
    if(arr[i] % 2 === 0) {
      oddAndEven.push("even")
    } else {
      oddAndEven.push("odd")
    }
  }
  return oddAndEven;
}

// 10. Create a function called timesTen that takes in an array and multiplies each value by 10 and returns the new array.
// Hint: Use the map method
function timesTen(arr) {
  return arr.map(function(x) {
    return x * 10;
  });
}
// Objects

// 1. Create an object called animal. Make sure the animal has the following keys. (species, name, age, gender, favoriteFood) Also, give the animal a method of speech that returns a string that displays what the animal says.
var animal = {
  species: "dog",
  name: "Hatchet",
  age: 5,
  gender: "male",
  favoriteFood: "popcorn",
  speech: function(){
    return "woof"
  }
}
// 2. Create a function called findAge that takes in an object and returns the age key value.
function findAge(obj) {
  return obj.age;
}
// 3. Create a function called getKeys that takes in an object and returns all of the key names (not values!).
function getKeys(obj) {
  return Object.keys(obj)
}
// 4. Create a function called changeName that takes in an object and a name value and replaces the object name with the given name value. Return the new object.
function changeName(obj, name) {
  obj.name = name
  return obj.name;
}
// 5. Create a function called speechMaker that takes in an object and returns the response from calling the speech method.
function speechMaker(obj) {
  return obj.speech();
}
// 6. Create a function called addKey that takes in an object and adds a new key name bedtime and assigns it a value. Return the object.
function addKey(obj) {
  obj.bedtime = "9:00 PM";
  return obj.bedtime;
}
// 7. Create a function called keyLoop that takes in an object and loops through each of the key values. If any of the key values are equal to "monkey", then return "There's a monkey!", otherwise return "There's no monkey here!".
function keyLoop(obj) {
  for(property in obj) {
    if(obj[property] === "monkey") {
      return "There's a monkey!";
    }
  }
  return "There's no monkey here!"
}
// Intermediate Arrays and Objects

// 1. Create an array called cars of 3 objects of 3 different cars with the key names of make, model, year.
var cars = [
  {
    make: "Ford",
    model: "Explorer",
    year: "2000"
  },

  {
    make: "Toyota",
    model: "Tundra",
    year: "2014"
  },

  {
    make: "Honda",
    model: "Pilot",
    year: "2008"
  }
]
// 2. Create a function called findModels that takes in an array, loops through the array and returns an array of all of the model values of each object.
function findModels(arr) {
     return arr.map(function(x) {
       return x.model;
     });
 }

module.exports = {
  arr: arr,
  findTwo: findTwo,
  pusher: pusher,
  upFront: upFront,
  remover: remover,
  copyCat: copyCat,
  chopIt: chopIt,
  sumIt: sumIt,
  evenOdd: evenOdd,
  timesTen: timesTen,
  animal: animal,
  findAge: findAge,
  getKeys: getKeys,
  changeName: changeName,
  speechMaker: speechMaker,
  addKey: addKey,
  keyLoop: keyLoop,
  cars: cars,
  findModels: findModels
}