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JavaScript Class 1 - Practice Exercises

Instructions

  • Complete all exercises in order
  • Test your code in the browser console
  • Don't look at solutions until you've tried!
  • If stuck for more than 10 minutes, ask for help

Exercise Set 1: Arrow Functions (5 minutes)

Convert these traditional functions to arrow functions:

Exercise 1.1

function square(x) {
  return x * x;
}

Exercise 1.2

function isEven(num) {
  return num % 2 === 0;
}

Exercise 1.3

function fullName(first, last) {
  return first + " " + last;
}

Exercise 1.4

function greet(name) {
  return "Hello " + name;
}

Exercise 1.5

function multiply(a, b) {
  return a * b;
}

Exercise Set 2: Template Literals (3 minutes)

Rewrite using template literals:

Exercise 2.1

const name = "Alice";
const age = 25;
const message = "My name is " + name + " and I am " + age + " years old.";

Exercise 2.2

const product = "Laptop";
const price = 999;
const text = "The " + product + " costs $" + price;

Exercise 2.3

const city = "New York";
const country = "USA";
const location = city + ", " + country;

Exercise Set 3: Array Methods - map() (10 minutes)

Use the following data for exercises 3.1-3.5:

const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

const students = [
  { name: "Alice", score: 85 },
  { name: "Bob", score: 92 },
  { name: "Charlie", score: 78 },
  { name: "David", score: 95 },
  { name: "Eve", score: 88 }
];

const products = [
  { id: 1, name: "Laptop", price: 999 },
  { id: 2, name: "Phone", price: 699 },
  { id: 3, name: "Tablet", price: 449 },
  { id: 4, name: "Watch", price: 299 }
];

Exercise 3.1

Create a new array where each number is doubled.

Exercise 3.2

Create a new array where each number is squared.

Exercise 3.3

Get an array of all student names.

Exercise 3.4

Get an array of all student scores.

Exercise 3.5

Get an array of all product names.

Exercise 3.6

Create an array of strings like: "Laptop costs $999" for each product.

Exercise 3.7

Create an array where each student score is increased by 5 points.

Exercise Set 4: Array Methods - filter() (10 minutes)

Exercise 4.1

From the numbers array, get only even numbers.

Exercise 4.2

From the numbers array, get only numbers greater than 5.

Exercise 4.3

From the students array, get students who scored above 85.

Exercise 4.4

From the products array, get products that cost more than $500.

Exercise 4.5

From the students array, get students whose names start with a vowel (A, E, I, O, U).

Exercise 4.6

From the products array, get products with names longer than 5 characters.

Exercise Set 5: Array Methods - find() (5 minutes)

Exercise 5.1

Find the first student with a score of 92.

Exercise 5.2

Find the product with id of 3.

Exercise 5.3

Find the first number greater than 7.

Exercise 5.4

Find the first student whose name is "Eve".

Exercise Set 6: Chaining Methods (10 minutes)

Exercise 6.1

From students, get names of students who scored above 80.

Exercise 6.2

From products, get names of products that cost less than $700.

Exercise 6.3

From numbers, get even numbers and then square them.

Exercise 6.4

From students, get scores above 85 and then increase each by 5.

Exercise 6.5

From products, get products under $500, then format as "Name: $Price".

Exercise Set 7: Destructuring (5 minutes)

Exercise 7.1

Extract name and age from this object:

const user = {
  name: "John",
  age: 30,
  email: "john@example.com",
  city: "Boston"
};

Exercise 7.2

Extract city and zip from this nested object:

const person = {
  name: "Alice",
  address: {
    street: "123 Main St",
    city: "NYC",
    zip: "10001"
  }
};

Exercise 7.3

Extract first two items from this array:

const colors = ["red", "blue", "green", "yellow", "purple"];

Exercise 7.4

Destructure in the function parameter:

const user = { name: "Bob", age: 25, role: "admin" };

// Write a function that takes this object and returns:
// "Bob is 25 years old and is an admin"
// Use destructuring in the parameter

Exercise Set 8: Spread Operator (5 minutes)

Exercise 8.1

Combine these two arrays:

const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];

Exercise 8.2

Create a copy of this object with age changed to 26:

const user = { name: "John", age: 25, email: "john@example.com" };

Exercise 8.3

Add a new item to the beginning of this array (without modifying original):

const numbers = [2, 3, 4, 5];
// Add 1 to the beginning

Exercise 8.4

Merge these two objects:

const defaults = { theme: "light", fontSize: 14 };
const userSettings = { fontSize: 16, language: "en" };
// Result should be: { theme: "light", fontSize: 16, language: "en" }

Exercise Set 9: Ternary Operator (3 minutes)

Exercise 9.1

Create a variable status that is "Adult" if age >= 18, otherwise "Minor":

const age = 20;

Exercise 9.2

Create a variable discount that is 10 if total > 100, otherwise 0:

const total = 150;

Exercise 9.3

Create a variable message that shows "Welcome back!" if logged in, otherwise "Please log in":

const isLoggedIn = true;

Bonus Challenges (Optional)

Challenge 1: Combined Skills

Given this data:

const orders = [
  { id: 1, customer: "John", total: 150, status: "completed" },
  { id: 2, customer: "Jane", total: 89, status: "pending" },
  { id: 3, customer: "Bob", total: 200, status: "completed" },
  { id: 4, customer: "Alice", total: 45, status: "cancelled" },
  { id: 5, customer: "Charlie", total: 175, status: "completed" }
];
  1. Get total revenue from completed orders only
  2. Get names of customers with pending orders
  3. Get orders over $100 and format as: "Order #1: $150 - John"

Challenge 2: Data Transformation

const rawData = [
  { firstName: "John", lastName: "Doe", age: 25, active: true },
  { firstName: "Jane", lastName: "Smith", age: 30, active: false },
  { firstName: "Bob", lastName: "Johnson", age: 35, active: true }
];

Transform to:

[
  { fullName: "John Doe", age: 25, status: "Active" },
  { fullName: "Jane Smith", age: 30, status: "Inactive" },
  { fullName: "Bob Johnson", age: 35, status: "Active" }
]

Challenge 3: Nested Data

const departments = [
  {
    name: "Engineering",
    employees: [
      { name: "Alice", salary: 120000 },
      { name: "Bob", salary: 100000 }
    ]
  },
  {
    name: "Marketing",
    employees: [
      { name: "Charlie", salary: 80000 },
      { name: "David", salary: 75000 }
    ]
  }
];
  1. Get all employee names across all departments
  2. Calculate total salary expense for the company
  3. Find all employees earning over $90000

Submission

  • Complete exercises in a JavaScript file
  • Test all your solutions
  • Submit via your lms
  • Deadline: Before Class 2

Good luck! 🚀