Homework & Coding Practice

Homework/Practice Coding Assignment (20-min)

Write a Module That Exports Utility Functions for String Manipulation

Steps:

1. Step 1: Create a directory named string-utils and initialize it:

   bash코드 복사mkdir string-utils
   cd string-utils
   npm init -y

2. Step 2: Create a file named stringUtils.js with utility functions:

   javascript코드 복사const reverseString = (str) => str.split('').reverse().join('');
   const toUpperCase = (str) => str.toUpperCase();
   const toLowerCase = (str) => str.toLowerCase();
   
   module.exports = { reverseString, toUpperCase, toLowerCase };

3. Step 3: Create another file app.js to test the module:

   javascript코드 복사const { reverseString, toUpperCase, toLowerCase } = require('./stringUtils');
   
   const testString = 'Hello World';
   console.log('Original:', testString);
   console.log('Reversed:', reverseString(testString));
   console.log('Uppercase:', toUpperCase(testString));
   console.log('Lowercase:', toLowerCase(testString));

4. Step 4: Run the application:

   bash코드 복사node app.js

5. Expected Output:

   makefile코드 복사Original: Hello World
   Reversed: dlroW olleH
   Uppercase: HELLO WORLD
   Lowercase: hello world

6. Step 5: Experiment with adding a new function, such as capitalize, and test it:

   javascript코드 복사const capitalize = (str) => str.charAt(0).toUpperCase() + str.slice(1).toLowerCase();
   module.exports = { reverseString, toUpperCase, toLowerCase, capitalize };

Expected Outcomes

1. Students understand how to create and use custom modules with CommonJS and ES6 syntax.

2. Students can differentiate between core and third-party modules.

3. Homework reinforces creating modular and reusable code.