ZEPPO :crystal_ball: :guitar:

Convert between numbers of different bases. :crystal_ball: :guitar:

ABOUT :books:

Roughly a year ago, I set myself the challenge of implementing a set of functions that could convert between numbers of different bases. I implemented this in Dart and decided to re-write this implementation in Javascript. The Dart implementation can be found here. The bases this library handles are: base 10, base 2, and base 16.

USAGE :hammer:

Use Zeppo in a Node.js project

To use Zeppo in a Node.js project, run this command in your project's root directory:

$ npm install --save-dev zeppo

Be sure to also add the "type":"module" flag to your project's manifest, package.json.

Use Zeppo in a Node.js project with Typescript

Add a file called zeppo.d.ts to your project and put the following code inside it:

declare module 'zeppo';

APIs

Zeppo offers the following functions:

• reverseArray(array): Reverses the order of an array and returns the reversed array.
• letterIndex(letter): Gets the index of a letter in the alphabet. Returns zero if the letter isn't in the alphabet.
• getLetterFromIndex(index): Gets the letter from a supplied index. Returns an empty string if a letter cannot be found.
• binToDec(binaryNumber): Converts a base 2 number to a base 10 number.
• decToBin(decimalNumber): Converts a base 10 number to a base 2 number.
• hexToDec(hexNumber): Converts a base 16 number to a base 10 number.
• isBin(expr): Checks whether the supplied string is a binary number or not.
• isInt(expr): Checks whether the supplied string is an integer or not.
• testAll(): Tests all of the above.

Example

Here's a small example:

• 1.) Initialize a new Node.js project with the following command in a directory of your choosing:

$ npm init -y 

• 2.) Install Zeppo:

$ npm install --save-dev zeppo

• 3.) Be sure to add this line to your project's package.json:

"type":"module",

• 4.) Create your index.js and put the following code inside it:

// index.js
import * as zeppo from 'zeppo';

function main(){
  var myNum = 21;
  console.log(zeppo.decToBin(myNum));
  // Should output 21.
  console.log(zeppo.binToDec(decToBin(myNum)));
}

main();

• 5.) Run the project:

$ node .

• 6.) Optional: If you're not sure how to use this project, check out the example project.

CHANGELOG :black_nib:

Version 1.0.0

• Initial release.
• Upload to GitHub.
• Upload to NPM.

Version 1.1.0

• New license file.
• Better documentation.

Version 1.2.0

• Updated documentation.
• Added a function to check whether a string is a binary number or not.

Version 1.3.0

• Updated documentation.
• Added a function to check whether a string is an integer or not.

Version 1.4.0

• Updated documentation.
• Updated, published, and uploaded under my new name.

Version 1.5.0

• Fixed some administrative issues.
• Fixed some formatting issues.

Version 1.6.0

• Updated export statement.
• Updated documentation for Typescript.

NOTE :scroll:

• Zeppo :crystal_ball: :guitar: by Alexander Abraham :black_heart: a.k.a. "Angel Dollface" :dolls: :ribbon:
• Licensed under the MIT license.