languages	tags
javascript	strings, methods

String Manipulation

Instructions

In this lab you'll be practicing manipulating strings.

1. In encoder.js create a method that will take a string and apply methods from the String class to it to make the original meaning of the string difficult to discern.

2. In decoder.js create a program that will take that mutated string from encoder.js and will return it to its original configuration, making the meaning of the string clear again.

Example

For instance, say we built a encoder method that changed letters that resembled numbers into numbers, subbed whitespace for money signs, and then reversed the order of the string. The string "the great gatsby" would be come "y65ta8$ta3r8$3ht".

message = "the great gatsby"
encoder(message)
// 1. change letters to numbers
// => "th3 8r3at 8at56y" 
// 2. replace whitespace with money signs
// => "th3$8r3at$8at56y" 
// 3. reverse the order
// => "y65ta8$ta3r8$3ht"

The decoder should be able to take the string "y65ta8$ta3r8$3ht" and turn it back into "the great gatsby".

encoded_message = "y65ta8$ta3r8$3ht"
decoder(encoded_message)
// 1. reverse back
// => "th3$8r3at$8at56y" 
// 2. replace money signs with whitespace
// => "th3 8r3at 8at56y" 
// 3. change numbers back into letters
// => "the great gatsby"

There are a ton of other ways to decode and encode strings so feel free to get creative!

To run the specs follow these commands:

• first install the required node modules to run the tests npm install
• to run in the command line run npm test -- spec/1-encoder.spec.js npm test -- spec/2-decoder.spec.js

or, via the custom script in package.json

npm run answer