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project-3.js
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155 lines (138 loc) · 4.26 KB
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// Do not change any of the function names
const makeCat = (name, age) => {
const newObj = {
name,
age,
meow() {
return 'Meow!';
}
};
return newObj;
// create a new object with a name property with the value set to the name argument
// add an age property to the object with the value set to the age argument
// add a method called meow that returns the string 'Meow!'
// return the object
};
const addProperty = (object, property) => {
object[property] = null;
return object;
// add the property to the object with a value of null
// return the object
// note: the property name is NOT 'property'. The name is the value of the argument called property (a string)
};
const invokeMethod = (object, method) => {
object[method]();
// method is a string that contains the name of a method on the object
// invoke this method
// nothing needs to be returned
};
const multiplyMysteryNumberByFive = (mysteryNumberObject) => {
return mysteryNumberObject.mysteryNumber * 5;
// mysteryNumberObject has a property called mysteryNumber
// multiply the mysteryNumber property by 5 and return the product
};
const deleteProperty = (object, property) => {
delete object[property];
return object;
// remove the property from the object
// return the object
};
const newUser = (name, email, password) => {
const newObj = {
name,
email,
password
}; return newObj;
// create a new object with properties matching the arguments passed in.
// return the new object
};
const hasEmail = (user) => {
if (user.email) {
return true;
}
return false;
// return true if the user has a value for the property 'email'
// otherwise return false
};
const hasProperty = (object, property) => {
if (object[property]) return true;
return false;
// return true if the object has the value of the property argument
// property is a string
// otherwise return false
};
const verifyPassword = (user, password) => {
if (user.password === password) return true;
return false;
// check to see if the provided password matches the password property on the user object
// return true if they match
// otherwise return false
};
const updatePassword = (user, newPassword) => {
user.password = newPassword;
return user;
// replace the existing password on the user object with the value of newPassword
// return the object
};
const addFriend = (user, newFriend) => {
user.friends.push(newFriend);
return user;
// user has a property called friends that is an array
// add newFriend to the end of the friends array
// return the user object
};
const setUsersToPremium = (users) => {
for (let i = 0; i < users.length; i++) {
users[i].isPremium = true;
}
return users;
// users is an array of user objects.
// each user object has the property 'isPremium'
// set each user's isPremium property to true
// return the users array
};
const sumUserPostLikes = (user) => {
let sum = 0;
const userLikes = user.posts;
userLikes.forEach((element) => {
sum += element.likes;
}); return sum;
// user has an array property called 'posts'
// posts is an array of post objects
// each post object has an integer property called 'likes'
// sum together the likes from all the post objects
// return the sum
};
const addCalculateDiscountPriceMethod = (storeItem) => {
const calculateDiscountPrice = function () {
let discountedprice = 0;
return discountedprice = this.price - (this.price * this.discountPercentage);
};
storeItem.calculateDiscountPrice = calculateDiscountPrice;
return storeItem;
// add a method to the storeItem object called 'calculateDiscountPrice'
// this method should multiply the storeItem's 'price' and 'discountPercentage' to get the discount
// the method then subtracts the discount from the price and returns the discounted price
// example:
// price -> 20
// discountPercentage -> .2
// discountPrice = 20 - (20 * .2)
};
// Do not modify code below this line.
// --------------------------------
module.exports = {
makeCat,
addProperty,
invokeMethod,
multiplyMysteryNumberByFive,
deleteProperty,
newUser,
hasEmail,
hasProperty,
verifyPassword,
updatePassword,
addFriend,
setUsersToPremium,
sumUserPostLikes,
addCalculateDiscountPriceMethod
};