Mastering JavaScript: Leap Year Checker

Introduction

In this lab, we will explore the fundamental concepts of JavaScript programming. Through a series of exercises, you will learn how to write basic JavaScript programs, including variables, data types, functions, and control flow structures. By the end of the lab, you will have a solid foundation in JavaScript programming and be able to apply your knowledge to solve real-world problems.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL javascript(("JavaScript")) -.-> javascript/BasicConceptsGroup(["Basic Concepts"]) javascript/BasicConceptsGroup -.-> javascript/variables("Variables") javascript/BasicConceptsGroup -.-> javascript/data_types("Data Types") javascript/BasicConceptsGroup -.-> javascript/arith_ops("Arithmetic Operators") javascript/BasicConceptsGroup -.-> javascript/comp_ops("Comparison Operators") subgraph Lab Skills javascript/variables -.-> lab-28423{{"Check for Leap Year"}} javascript/data_types -.-> lab-28423{{"Check for Leap Year"}} javascript/arith_ops -.-> lab-28423{{"Check for Leap Year"}} javascript/comp_ops -.-> lab-28423{{"Check for Leap Year"}} end

Code for Checking Leap Year

To check if a given year is a leap year, follow these steps:

Open the Terminal/SSH.
Type node to start coding.
Use the Date constructor and set the date to February 29th of the given year.
Check if the month is equal to 1 using Date.prototype.getMonth().
Use the following code snippet to check if a year is a leap year:

const isLeapYear = (year) => new Date(year, 1, 29).getMonth() === 1;

Here is an example of how to use this code:

isLeapYear(2019); // false
isLeapYear(2020); // true

Summary

Congratulations! You have completed the Check for Leap Year lab. You can practice more labs in LabEx to improve your skills.