Numeric enums in Typescript - Mini Project: Build & Apply

Numeric enums

📖 Scenario: Imagine you are creating a simple program to represent the days of the week using numbers. Each day will have a number starting from 0 for Sunday, 1 for Monday, and so on.

🎯 Goal: You will create a numeric enum called Days for the days of the week, then write code to get the number for Wednesday and print it.

📋 What You'll Learn

Create a numeric enum called Days with days Sunday to Saturday starting at 0

Create a variable called midWeek and assign it the value of Days.Wednesday

Print the value of midWeek to the console

💡 Why This Matters

🌍 Real World

Numeric enums are useful when you want to represent a fixed set of related constants with numbers, like days, months, or status codes.

💼 Career

Understanding enums helps in writing clear and maintainable code in TypeScript, which is widely used in web development and software engineering jobs.

1

Create the numeric enum

Create a numeric enum called Days with these exact members and values: Sunday = 0, Monday = 1, Tuesday = 2, Wednesday = 3, Thursday = 4, Friday = 5, Saturday = 6.

Typescript

// Your code here

Need a hint?

Use the enum keyword followed by the name Days. Assign numbers starting at 0 to each day.

2

Assign a variable from the enum

Create a variable called midWeek and assign it the value Days.Wednesday.

Typescript

enum Days {
  Sunday = 0,
  Monday = 1,
  Tuesday = 2,
  Wednesday = 3,
  Thursday = 4,
  Friday = 5,
  Saturday = 6
}

// Your code here

Need a hint?

Use let midWeek = Days.Wednesday; to assign the enum value.

3

Use the enum value in a function

Create a function called isMidWeek that takes a parameter day of type Days and returns true if day equals Days.Wednesday, otherwise false. Then call isMidWeek with midWeek and assign the result to a variable called check.

Typescript

enum Days {
  Sunday = 0,
  Monday = 1,
  Tuesday = 2,
  Wednesday = 3,
  Thursday = 4,
  Friday = 5,
  Saturday = 6
}

let midWeek = Days.Wednesday;

// Your code here

Need a hint?

Write a function that compares the input day to Days.Wednesday and returns true or false.

4

Print the result

Print the value of midWeek and the value of check to the console using two separate console.log statements.

Typescript

enum Days {
  Sunday = 0,
  Monday = 1,
  Tuesday = 2,
  Wednesday = 3,
  Thursday = 4,
  Friday = 5,
  Saturday = 6
}

let midWeek = Days.Wednesday;

function isMidWeek(day: Days): boolean {
  return day === Days.Wednesday;
}

let check = isMidWeek(midWeek);

// Your code here

Need a hint?

Use console.log(midWeek); and console.log(check); to print the values.