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<!DOCTYPE html>
<html lang="en">
<head>
<title>Web Sprint 3 Challenge</title>
<style>
* {
font-family: 'Times New Roman', Times, serif
}
.widget {
padding: 0 0 0.5rem 0.65rem;
margin-bottom: 0.5rem;
border: 1px solid black;
border-radius: 0.5rem;
}
.widget p {
font-style: italic;
}
</style>
</head>
<body>
<h1>Web Sprint 3 Challenge </h1>
<p>❗ See the last script tag for instructions on completing your Challenge</p>
<!-- widgets start, do not modify -->
<section class="widget">
<p>This widget uses the EBook class</p>
<textarea placeholder="Write your book"></textarea><br />
<input type="number" placeholder="Characters per page" /><br /><br />
<button id="turnPage">Turn Page</button>
<p id="bookPage"></p>
</section>
<!-- widgets end -->
<!-- The first script tag loads a library called lodash that helps with testing -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>
<script id="challenge">
// In CHALLENGES 1-4 you will write JavaScript classes
// ❗ Do not rename the classes provided
// ❗ Do not alter the position of the script tags
// ❗ Debug properly using the Console
// 👉 CHALLENGE 1 - Integers
class Integers {
// 🧠 Constructor takes **any** number of arguments, which are integers
// 🧠 Instances have an `ints` property which is an array holding the integers above in the same order
// 🧠 Implement a `getAll` method which returns the data held in the `ints` property
// 🧠 Implement a `getEvens` method which returns an array with the integers that are even
// 🧠 Implement a `getNegatives` method which returns an array with the integers that negative
// 🧠 Implement a `getAllSquared` method which returns an array with the integers squared
// 🧠 Implement a `pop` method which removes the last integer from `ints` and returns it
// 🧠 Implement a `push` method which takes an int and pushes it to the end of `ints`, and returns the updated `ints` property
// 🧠 Implement a `getEveryNth` method which takes an int `n` and returns an array with the ints at position 0, n, n + n, n + n + n, etc
// 🧠 Implement a `getAllReversed` method which returns the ints in reverse order
// ❗ WARNING: except for `getAllReversed`, methods must respect the order of the integers
// ❗ WARNING: note that except for push and pop, the methods don't change the `ints` property
}
// 👉 CHALLENGE 2 NerfGun
class NerfGun {
// 🧠 Constructor takes one argument: the total number of projectiles supported by the instance
// 🧠 New instances initialize fully loaded and with the safety on
// 🧠 Instances have a `shoot` method that takes no arguments:
// * If there is ammo left and safety is off, method consumes one projectile and returns the string "Bang!"
// * Shooting on empty or with the safety on, returns the string "Click!"
// 🧠 Instances have a `reload` method that takes a number and tops up the instance by that number
// * Reloading returns a string in the following format: "<number> projectiles left!"
// * Reloading by more than capacity fills the instance to capacity
// * Passing an argument which is not a number larger than zero returns the string "Error reloading!"
// 🧠 Instances have a `toggleSafety` method that takes no arguments and switches the state of the safety
// * When engaging the safety, return "Safety enabled!"
// * When disengaging the safety, return "Safety disabled!"
// 🌟 HINT: instances need to keep track of their maximum capacity as well as their current capacity
}
// 👉 CHALLENGE 3 EBook
class EBook {
// 🧠 Constructor takes two arguments:
// * First arg is a string with the whole text of the book
// * Second arg is the number of characters contained in a single page of the book
// 🧠 Instances have a `next` method:
// * It takes no args and returns the next page of the book
// * If the next page is empty because we have reached the end, return null instead
// 🧠 Example of usage:
// const ebook = new EBook('abcdefg', 3)
// ebook.next() // returns "abc"
// ebook.next() // returns "def"
// ebook.next() // returns "g"
// ebook.next() // returns null
// 🌟 HINT: remember about the `slice` method which strings and arrays have
// ❗ Feel free to implement `back`, although this is not required nor graded
}
// 👉 CHALLENGE 4 AntFarm
class AntFarm {
// 🧠 Constructor takes **any** number of arguments, which are strings: the names of your ants
// 🧠 Instances of AntFarm have an `ants` property holding an array of ants:
// * Each ant is an object with a `name` prop and a `health` prop that starts at 100
// 🧠 Instances of AntFarm have a `work` method:
// * When invoked your ants do chores at a cost of 20 health points each
// * The method takes no arguments and returns the string "<ant number> ants starting work!"
// * If the `health` of any ant decreases to zero or below, it dies and is removed from `ants`
// * If `ants` contains no ants, the method returns "No ants here. Did you work them to death?"
// 🧠 Instances of AntFarm have a `feed` method:
// * The method takes as its only argument the name of the particular ant(s) to feed
// * When invoked, the ant(s) by the given name obtain a health increase of 15 points
// * The method returns the string "Yum!" if any ants by the given name exist
// * The method returns the string "<ant name> not found!" if no ants by the given name exist
// 🌟 Example:
// const farm = new AntFarm('Jess', 'Blake');
// farm.ants; // evaluates to [{name: 'Jess', health: 100}, {name: 'Blake', health: 100}]
// farm.work(); // returns "2 ants starting work!"
// farm.ants; // evaluates to [{name: 'Jess', health: 80}, {name: 'Blake', health: 80}]
// farm.feed('Jess'); // returns "Yum!"
// farm.ants; // evaluates to [{name: 'Jess', health: 95}, {name: 'Blake', health: 80}]
// 👉 HINT: when replacing a list with a modified list of the same length you can use map:
// let list = ['a','b','c']
// list = list.map(item => (item === "a" ? item + item : item))
// console.log(list) // prints ["aa","b","c"]
// 👉 HINT: when replacing a list with a filtered list you can use filter:
// let list = ['a','b','c']
// list = list.filter(item => item === "a")
// console.log(list) // prints ["a"]
// 👉 HINT: if you are not feeling confident with map and filter, solve the problem with for loops,
// and with the piece of mind of all tests passing, refactor to use map/filter
}
// 🧪 TESTS, do not make any changes below this line ===================
// 🧪 TESTS, do not make any changes below this line ===================
// 🧪 TESTS, do not make any changes below this line ===================
globalThis.challengeVersion = 1
globalThis.Integers = Integers
globalThis.NerfGun = NerfGun
globalThis.EBook = EBook
globalThis.AntFarm = AntFarm
try {
testClass('CHALLENGE 1 - class Integers', [
function () {
let actual, description = 'getAll returns all the ints'
let expected = [1, 2, 3, 4]
try {
const ints = new Integers(1, 2, 3, 4)
actual = ints.getAll()
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'getEvens returns the even ints'
let expected = [0, 2, 4]
try {
const ints = new Integers(0, 2, 3, 5, 4)
actual = ints.getEvens()
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'getNegatives returns the negative ints'
let expected = [-3, -5]
try {
const ints = new Integers(-3, 5, -5, 0)
actual = ints.getNegatives()
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'getAllSquared returns the ints squared'
let expected = [4, 1, 0, 36, 25]
try {
const ints = new Integers(2, 1, 0, 6, 5)
actual = ints.getAllSquared()
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'pop removes the last int and returns it'
let expected = [3, [1, 2]]
try {
const ints = new Integers(1, 2, 3)
actual = []
actual.push(ints.pop())
actual.push(ints.ints)
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'push adds an integer into ints and returns the updated ints'
let expected = [[1, 2, 3, 4], [1, 2, 3, 4]]
try {
const ints = new Integers(1, 2, 3)
actual = []
actual.push(ints.push(4))
actual.push(ints.ints)
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'getEveryNth returns ints at every nth index'
let expected = [[1, 3, 5], [1, 4]]
try {
const ints = new Integers(1, 2, 3, 4, 5, 6)
actual = []
actual.push(ints.getEveryNth(2))
actual.push(ints.getEveryNth(3))
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'getAllReversed returns the ints in reverse order'
let expected = [[6, 5, 4, 3, 2, 1], [0, 1, 9, 3, 6, 9]]
try {
const ints = new Integers(1, 2, 3, 4, 5, 6)
const ints2 = new Integers(9, 6, 3, 9, 1, 0)
actual = []
actual.push(ints.getAllReversed())
actual.push(ints2.getAllReversed())
} catch (err) { actual = err.message }
return [description, expected, actual]
},
])
testClass('CHALLENGE 2 - class NerfGun', [
function () {
let actual, description = 'A new NerfGun has its safety on'
let expected = "Click!"
try {
const nerf = new NerfGun(6)
actual = nerf.shoot()
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'A NerfGun can disable safety, shoot, re-enable safety'
let expected = ["Safety disabled!", "Bang!", "Safety enabled!", "Click!"]
try {
const nerf = new NerfGun(6)
actual = []
actual.push(nerf.toggleSafety())
actual.push(nerf.shoot())
actual.push(nerf.toggleSafety())
actual.push(nerf.shoot())
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'A NerfGun can not shoot after running out of projectiles'
let expected = ["Bang!", "Bang!", "Bang!", "Click!"]
try {
const nerf = new NerfGun(3)
nerf.toggleSafety()
actual = []
actual.push(nerf.shoot()); actual.push(nerf.shoot()); actual.push(nerf.shoot()); actual.push(nerf.shoot())
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'A NerfGun can be reloaded to less than capacity'
let expected = ["2 projectiles left!", "Bang!", "Bang!", "Click!"]
try {
const nerf = new NerfGun(3)
nerf.toggleSafety()
nerf.shoot()
nerf.shoot()
nerf.shoot()
actual = []
actual.push(nerf.reload(2))
actual.push(nerf.shoot()); actual.push(nerf.shoot()); actual.push(nerf.shoot())
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'Reloading to more than capacity only fills NerfGun to capacity'
let expected = ["3 projectiles left!", "Bang!", "Bang!", "Bang!", "Click!"]
try {
const nerf = new NerfGun(3)
nerf.toggleSafety()
nerf.shoot()
actual = []
actual.push(nerf.reload(100))
actual.push(nerf.shoot()); actual.push(nerf.shoot())
actual.push(nerf.shoot()); actual.push(nerf.shoot())
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'Reloading NerfGun incorrectly yields an error message'
let expected = ["Error reloading!", "Error reloading!", "Error reloading!"]
try {
const nerf = new NerfGun(6)
actual = []
actual.push(nerf.reload(0))
actual.push(nerf.reload(-1))
actual.push(nerf.reload('5'))
} catch (err) { actual = err.message }
return [description, expected, actual]
},
])
testClass('CHALLENGE 3 - class EBook', [
function () {
let actual, description = 'Ebook can turn pages'
let expected = ['abc', 'def', 'g']
try {
const book = new EBook('abcdefg', 3)
actual = []
actual.push(book.next()); actual.push(book.next()); actual.push(book.next())
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'Turning page yields null when there is no more text'
let expected = ['abcd', 'efgh', 'ij', null, null]
try {
const book = new EBook('abcdefghij', 4)
actual = []
actual.push(book.next()); actual.push(book.next()); actual.push(book.next())
actual.push(book.next()); actual.push(book.next())
} catch (err) { actual = err.message }
return [description, expected, actual]
},
])
testClass('CHALLENGE 4 - class AntFarm', [
function () {
let actual, description = 'AntFarm initializes the ants correctly'
let expected = [
{ name: 'Jess', health: 100 }, { name: 'Blake', health: 100 }, { name: 'Jess', health: 100 }
]
try {
const farm = new AntFarm('Jess', 'Blake', 'Jess')
actual = farm.ants
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'Working substracts 20 health points'
let expected = [
{ name: 'Jess', health: 80 }, { name: 'Blake', health: 80 }, { name: 'Jess', health: 80 }
]
try {
const farm = new AntFarm('Jess', 'Blake', 'Jess')
farm.work()
actual = farm.ants
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'Overworking kills the ants'
let expected = []
try {
const farm = new AntFarm('Jess', 'Blake', 'Jess')
farm.work(); farm.work(); farm.work(); farm.work(); farm.work()
actual = farm.ants
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'Working returns the correct string'
let expected = ["3 ants starting work!", "1 ants starting work!", "No ants here. Did you work them to death?"]
try {
const farm = new AntFarm('Jess', 'Blake', 'Jess')
farm.ants[0].health++
actual = []
farm.work(); farm.work(); farm.work(); farm.work()
actual.push(farm.work()); actual.push(farm.work()); actual.push(farm.work())
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'Feeding increases 15 health points of lucky ant(s)'
let expected = [{ name: "Jess", "health": 115 }, { name: "Blake", health: 100 }, { name: "Jess", health: 115 }]
try {
const farm = new AntFarm('Jess', 'Blake', 'Jess')
farm.feed('Jess')
actual = farm.ants
} catch (err) { actual = err.message }
return [description, expected, actual]
},
function () {
let actual, description = 'Feeding returns the correct string'
let expected = ["Yum!", "bad name not found!", "another bad name not found!"]
try {
const farm = new AntFarm('Jess', 'Blake', 'Jess')
actual = []
actual.push(farm.feed('Blake'))
actual.push(farm.feed('bad name'))
actual.push(farm.feed('another bad name'))
} catch (err) { actual = err.message }
return [description, expected, actual]
},
])
function testClass(testTitle, tests) {
console.log(testTitle)
tests.forEach((test, idx) => {
const [, expected, actual] = test()
const [desJSON, expJSON, actJSON] = test().map(JSON.stringify)
if (_.isEqual(expected, actual)) {
console.log(`\t✅ Test ${idx + 1} ${desJSON} PASSED`)
} else {
console.log(`\t❌ Test ${idx + 1} ${desJSON} FAILED:
Expected ${expJSON}
Actual ${actJSON}`)
}
})
}
let getTextArea = () => document.querySelector('.widget textarea')
let getNumberInput = () => document.querySelector('.widget input[type=number]')
const getText = () => getTextArea().value
const getChars = () => Number(getNumberInput().value)
turnPage.disabled = true
let book
let updateBook = () => {
turnPage.disabled = (getText() && getChars() && getChars() > 0) ? false : true
book = new EBook(getText(), getChars())
}
getTextArea().oninput = updateBook
getNumberInput().oninput = updateBook
turnPage.onclick = () => {
bookPage.textContent = book.next() || 'The End'
}
} catch (err) { console.error(err.stack) }
</script>
</body>
</html>