Skip to main content

Exercise: JS Selection Statements

Objective#

Your objective is to practice JavaScript selection statements with number guessing validation logic. The user should be prompted to give a number guess, and receive feedback whether the number they guessed was the correct number or not.

Steps#

Clone the exercise repo: JavaScript Selection Statements

Prerequisites#

JavaScript has a built-in function for taking input from a user on a webpage. window.prompt, or simply prompt, will display a prompt to the user on a webpage and give them an input box for submitting data. You can store this data in a variable, or use it directly in your program.

prompt("What is your name?") will prompt the user with that question, and return their answer to that point in your program.

Example:

let answer = prompt("What is your name");
console.log("Hello, " + answer); // prints a message using the answer inputted by the user

Exercise 1#

  1. Initialize an integer to represent a favorite number and assign a value with a number of your choosing or you can assign a random number to this variable.
  2. Use window.prompt() to ask the user to input a number, and store the result in a variable
  3. Create an if-statement that if the guessed number is below the initial value, print out "too low".
  4. Create an else-if statement that if the number is higher than the initial value, print out "too high".
  5. Create an else statement that prints out "Congratulations!!!".

Exercise 2#

Your goal is to take a user's birth month, and print out the season they were born in.

  1. Declare a variable named birthMonth and set the value as the result of window.prompt("What is your birth month?").
  2. Create a switch-case statement with cases and a default case.
  3. Print a response to the console that displays the season that the user was born in depending on their birth month input.

Exercise 3#

Given business logic that is written in the form of if/else statements, rewrite the program with switch cases.

Start with the following code:

let typeId = "01";
let colorId = "PU";
let sizeId = "L";
let type = "";
let color = "";
let size = "";
if (typeId == "01") {
type = "Tank top";
} else if (typeId == "02") {
type = "T-Shirt";
} else if (typeId == "03") {
type = "Long Sleeve";
} else if (typeId == "04") {
type == "Sweat Shirt";
} else {
type = "Other";
}
if (colorId == "BL") {
color = "Black";
} else if (colorId == "BL") {
color = "Blue";
} else if (colorId == "RD") {
color = "Red";
} else if (colorId == "PU") {
color = "Purple";
} else {
color = "White";
}
if (sizeId == "S") {
size = "Small";
} else if (sizeId == "M") {
size = "Medium";
} else if (sizeId == "L") {
size = "Large";
} else if (sizeId == "XL") {
size = "Extra Large";
} else {
size = "One Size Fits All";
}
console.log(`Product: ${size} ${color} ${type}`);

After you refactor your program to use switch cases inplace of if/else statements, your output should read:

Product: Large Purple Tank Top