Thom Page
10 years ago
parent
69fd765eed
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4376cbf536
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// ARRAYS AND OBJECTS
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// =====================================================
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// Find the median number in the following nums array, then console.log that number.
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var nums = [14,11,16,15,13,16,15,17,19,11,12,14,19,11,15,17,11,18,12,17,12,71,18,15,12];
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nums.sort();
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var half = Math.floor(nums.length / 2);
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console.log(nums[half]);
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// => 15
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// =====================================================
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// Given the following object:
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var obj = {
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name: "Slimer",
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color: "greenish",
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type: "plasm or ghost or something"
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}
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// What would you write to access the name and console.log it?
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console.log(obj.name);
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// OR
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console.log(obj['name']);
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// What would you write to change the type to 'creature'
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obj.type = "creature";
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// What would you write to add a key to the object called age, and set the age to 6?
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obj.age = 6;
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console.log(obj);
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// LOOPS
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// =====================================================
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// If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9.
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// The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000.
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var i = 1;
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var sum = 0;
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while (i < 1000) {
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if (i % 3 === 0 || i % 5 === 0) {
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sum += i;
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}
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i++;
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}
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console.log(sum);
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// =====================================================
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// Write a *for* loop that can iterate over the Wilkersons array below, starting from the middle of the array.
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// 'Malcom' is in the middle of the array. In the loop,
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// console.log 'Malcolm' and everything after 'Malcolm' in the array.
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var Wilkersons = ["Lois", "Dewie", "Francis", "Malcolm", "Reese", "Hal"];
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for (var i = Wilkersons.length / 2; i < Wilkersons.length; i++ ) {
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console.log(Wilkersons[i]);
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}
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// Write a *for* loop for the following `plusJamie` array. Note that this array has an _odd_ number of elements
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// 'Malcom' is still in the middle. Within the loop, console.log everything from the middle (Malcolm), and onwards:
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var plusJamie = ["Lois", "Dewie", "Francis", "Malcolm", "Reese", "Hal", "Jamie"];
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var half = Math.floor(plusJamie.length / 2);
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for (var i = half; i < plusJamie.length; i++) {
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console.log(plusJamie[i]);
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}
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// FUNCTIONS
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// =======================================
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// Write a function 'palindrome' that accepts a single argument, a string. The function
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// should return true if the string is a palindrome, false if it is not. Make sure your
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// function will give the correct answer for words with capital letters.
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var palindrome = function(input) {
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var comparison = input.toLowerCase().split('').reverse().join('');
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if (comparison === input.toLowerCase()) {
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return true;
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}
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return false;
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}
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console.log(palindrome("Radar"));
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// => True
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console.log(palindrome("Borscht"));
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// => False
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// =======================================
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// Define a function maxOfThree that takes three numbers as arguments and returns
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// the largest of them.
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var maxOfThree = function(num1, num2, num3) {
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return [num1, num2, num3].sort().pop();
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}
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console.log(maxOfThree(6, 9, 1));
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// => 9
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// OR
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var maxOfThree2 = function(num1, num2, num3) {
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if (num1 > num2 && num1 > num3) {
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return num1;
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} else if (num2 > num3) {
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return num2;
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}
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return num3;
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}
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console.log(maxOfThree2(6, 9, 1));
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// => 9
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// =======================================
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//Write a function pythagoras that that takes two arguments: sideA and sideB,
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//and returns the solution for sideC using the Pythagorean theorem.
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var pythagoras = function(sideA, sideB) {
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var sideCsquared = (sideA * sideA) + (sideB * sideB);
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return Math.sqrt(sideCsquared);
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}
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console.log(pythagoras(8, 6));
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// =======================================
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// Write a function called `calc` ...
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var calc = function(num1, num2, operation) {
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if (operation === "sum") {
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return num1 + num2
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} else if (operation === "sub") {
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return num1 - num2;
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} else if (operation === "mult") {
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return num1 * num2;
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} else if (operation === "div") {
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return num1 / num2;
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} else if (operation === "exp") {
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return Math.pow(num1, num2);
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} else {
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return "error"
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}
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}
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console.log(calc(4, 3, "exp"));
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// =======================================
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// Write a function `isAVowel` that takes a character (i.e. a string of length 1)
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// and returns true if it is a vowel, false otherwise.
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var isAVowel = function(char) {
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return /[aeiou]/.test(char.toLowerCase());
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}
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console.log(isAVowel("a"));
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// => true
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// OR
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var isAVowel2 = function(char) {
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var vowels = ["a", "e", "i", "o", "u"];
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for (var i=0; i < vowels.length; i++) {
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if (vowels[i] === char.toLowerCase()) {
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return true
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}
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}
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return false
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}
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console.log(isAVowel2("a"));
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// => true
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// =======================================
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// Write a function `sumArray` that sums the numbers in an array of numbers.
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var sumArray = function(arr) {
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var sum = 0;
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for (var i=0; i < arr.length; i++) {
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sum += arr[i];
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}
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return sum;
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}
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console.log(sumArray([1, 2, 3, 4]));
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// =======================================
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// Write a function that returns the number of arguments passed to the function when called.
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// You will need to research how to solve this.
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var args = function() {
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return arguments.length;
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}
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console.log(args(1, 2, 3, 4));
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// => 4
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console.log(args([], {}, true));
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// => 3
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// SCOPE
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// =======================================
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// 1. showColor does not require a parameter because hexColor is in global scope,
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// which means hexColor is available in any scope. Therefore showColor can 'borrow' hexColor from the global scope.
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// 2. The output will be the argument that was passed into the showColor function,
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// because it takes precedence over the global scope.
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// 3. theOther cannot access the value of num because the value is not in its scope.
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// 4. scopeExample will not log the number 8, because num was redefined to the number
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// NESTED DATA
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// =======================================
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var solarSystem = [
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{ name: "Mercury", ringSystem: false, moons: [] },
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{ name: "Venus", ringSystem: false, moons: [] },
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{ name: "Earth", ringSystem: false, moons: ["The Moon"] },
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{ name: "Mars", ringSystem: false, moons: ["Phobos", "Deimos"] },
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{ name: "Jupiter", ringSystem: true, moons: ["Europa", "Ganymede", "Io", "Callisto"] },
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{ name: "Saturn", ringSystem: true, moons: ["Titan", "Enceladus", "Rhea", "Mimas"] },
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{ name: "Uranus", ringSystem: true, moons: ["Miranda", "Titania", "Ariel", "Umbriel"] },
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{ name: "Neptune", ringSystem: true, moons: ["Triton", "Nereid"] }
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];
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// Print the array of Jupiter's moons to the console.
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console.log(solarSystem[4].moons);
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// Print the name of Neptune's moon "Nereid" to the console.
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console.log(solarSystem[7].moons[1]);
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// Add a new moon called "Endor" to Venus' moons array.
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solarSystem[1].moons.push("Endor");
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// Add a Pluto object to the solarSystem array using .push.
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// The object should contain Pluto's name, ringSystem boolean, and moons array
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// (which includes "Charon").
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solarSystem.push({ name: "Pluto", ringSystem: false, moons: ["Charon"]});
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// Add a new key value pair to the the Earth object: the key should be 'diameter',
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// and the value should be Earth's diameter in miles.
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solarSystem[2].diameter = "7,915";
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// Change Mercury's ringSystem boolean to true.
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solarSystem[0].ringSystem = true;
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// Change Uranus' moon "Umbriel" to "Oberon"
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solarSystem[6].moons[3] = "Oberon";
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// Iterate through the solarSystem array and print only the objects that
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// have a ringSystem (where ringSystem: true)
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for (var i=0; i < solarSystem.length; i++) {
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if (solarSystem[i].ringSystem) {
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console.log(solarSystem[i]);
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}
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}
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// BONDFILMS
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// =======================================
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bondFilms = [
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{ "title" : "Skyfall", "year" : 2012, "actor" : "Daniel Craig", "gross" : "$1,108,561,008" },
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{ "title" : "Thunderball", "year" : 1965, "actor" : "Sean Connery", "gross" : "$1,014,941,117" },
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{ "title" : "Goldfinger", "year" : 1964, "actor" : "Sean Connery", "gross" : "$912,257,512" },
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{ "title" : "Live and Let Die", "year" : 1973, "actor" : "Roger Moore", "gross" : "$825,110,761" },
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{ "title" : "You Only Live Twice", "year" : 1967, "actor" : "Sean Connery", "gross" : "$756,544,419" },
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{ "title" : "The Spy Who Loved Me", "year" : 1977, "actor" : "Roger Moore", "gross" : "$692,713,752" },
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{ "title" : "Casino Royale", "year" : 2006, "actor" : "Daniel Craig", "gross" : "$669,789,482" },
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{ "title" : "Moonraker", "year" : 1979, "actor" : "Roger Moore", "gross" : "$655,872,400" },
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{ "title" : "Diamonds Are Forever", "year" : 1971, "actor" : "Sean Connery", "gross" : "$648,514,469" },
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{ "title" : "Quantum of Solace", "year" : 2008, "actor" : "Daniel Craig", "gross" : "$622,246,378" },
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{ "title" : "From Russia with Love", "year" : 1963, "actor" : "Sean Connery", "gross" : "$576,277,964" },
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{ "title" : "Die Another Day", "year" : 2002, "actor" : "Pierce Brosnan", "gross" : "$543,639,638" },
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{ "title" : "Goldeneye", "year" : 1995, "actor" : "Pierce Brosnan", "gross" : "$529,548,711" },
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{ "title" : "On Her Majesty's Secret Service", "year" : 1969, "actor" : "George Lazenby", "gross" : "$505,899,782" },
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{ "title" : "The World is Not Enough", "year" : 1999, "actor" : "Pierce Brosnan", "gross" : "$491,617,153" },
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{ "title" : "For Your Eyes Only", "year" : 1981, "actor" : "Roger Moore", "gross" : "$486,468,881" },
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{ "title" : "Tomorrow Never Dies", "year" : 1997, "actor" : "Pierce Brosnan", "gross" : "$478,946,402" },
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{ "title" : "The Man with the Golden Gun", "year" : 1974, "actor" : "Roger Moore", "gross" : "$448,249,281" },
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{ "title" : "Dr. No", "year" : 1962, "actor" : "Sean Connery", "gross" : "$440,759,072" },
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{ "title" : "Octopussy", "year" : 1983, "actor" : "Roger Moore", "gross" : "$426,244,352" },
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{ "title" : "The Living Daylights", "year" : 1987, "actor" : "Timothy Dalton", "gross" : "$381,088,866" },
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{ "title" : "A View to a Kill", "year" : 1985, "actor" : "Roger Moore", "gross" : "$321,172,633" },
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{ "title" : "License to Kill", "year" : 1989, "actor" : "Timothy Dalton", "gross" : "$285,157,191" }
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];
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// Determine the total cumulative gross of the Bond franchise.
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var sum = 0;
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for (var i=0; i < bondFilms.length; i++) {
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var value = parseInt(bondFilms[i].gross.replace(/[&\/\\#,+()$~%.'":*?<>{}]/g, ''));
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sum += value;
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}
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console.log('Total gross: ' + sum);
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// Create a new array with the names of the Bond films.
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var bondTitles = [];
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for (var i=0; i < bondFilms.length; i++) {
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bondTitles.push(bondFilms[i].title);
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}
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console.log(bondTitles);
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// Create a new array `oddBonds`, of only the Bond films released on odd-numbered years.
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var oddBonds = [];
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for (var i=0; i < bondFilms.length; i++) {
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if (bondFilms[i].year % 2 !== 0) {
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oddBonds.push(bondFilms[i]);
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}
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}
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console.log(oddBonds);
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// HUMDINGER
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