mervynteo / js-challenges

🏆A collection of Javascript coding challenges, from beginner to advanced.

Some javascript challenges from beginner to advanced.

Index

• What
• Why
• Challenges
  1. Round number
  2. Merge multiple arrays
  3. Sum content of an array
  4. Object forEach
  5. String reverse
  6. More Challenges
• Partecipating
• Contributing
  • Notes
• Related Repos

What?

A collection of Javascript coding challenges, from beginner to advanced. All challenges are taken from the generous web or created by some awesome contributors.

So, Why?

I'm creating this repo because I want to bring as many as possible code challenges (for free obviously) in a file or more. I know that there are so many websites like codewars or coderbyte but this is different. So many websites are not for free, you need to pay a subscription.

Challenges

Below a few challenges, you can get the full documentation here.

If you have an idea on how to improve this repo don't be shine, post a PR o open a new ISSUE!

1. ROUND NUMBER

   • NAME: round
   • DESCRIPTION: Write a function that round a number to given decimal places.

   	round(Math.PI, 2); // => 3.14 

2. MERGE MULTIPLE ARRAYS

   • NAME: arrayMerge
   • DESCRIPTION: Write a function that merges multiple given arrays.

   	arrayMerge([1, 2], [3, 4]); // => [1, 2, 3, 4]

3. SUM CONTENT OF AN ARRAY

   • NAME: arraySum
   • DESCRIPTION: Write a function to sum the content of an array.

   	arraySum([1, 2, 3]) // => 6

4. OBJECT FOREACH

   • NAME: objectForEach
   • DESCRIPTION: Write a forEach function that works with Objects.

   	var obj = {
   		first_name: 'Elon',
   		last_name: 'Musk'
   	}
   
   	objectForEach(obj, (key, value) => {
   		console.log(key, value) 
   	})
   
   	//=> 'first_name', 'Elon'
   	//=> 'last_name', 'Musk'

5. STRING REVERSE

   • NAME: reverseString
   • DESCRIPTION: Write a function that reverse a string.

   	reverseString('hello world!') //=> '!dlrow olleh'

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Participating

1. Clone this repo
2. Install all dependencies via npm install.
3. Fill all challenges in ./src/challenges.js.
4. Test them via npm run test.
5. Share the challenge on twitter via #jschallenges
6. Some ideas? Read below the contributing paragraph or open an ISSUE!

Contributing

1. Clone this repo.
2. Install all dependencies via npm install.
3. Write down your challenge (with solution) in ./src/challenges.js.
4. Write a test for your challenge in ./test/_your-challenge.js.
5. Import your test in the test.js file.
6. Test your challenge via npx ava ./test/_your-challenge.js.
7. Move your solution to ./src/solutions.js.
8. Submit your PR!

Contributing notes

All challenges need to follow this scheme:

(2 spaces between each challenge)

    /** 
     * CHALLEBGE <n>: <CHALLENGE-NAME>
     * @name <functionName>
     * @description <challenge-description>
     * @author <Your Name> <you[at]domain.com>
     * 
     * 
     * @example Usage:
     * functionName(args) //=> output
     * 
     * 
     * @param {Type} a ...
     * @param {Type} b ...
     * 
     * @returns {Type} ... 
    */
    module.exports.challenge_name = function() {}

If your challenge is taken from forums please link the thread or the stackoverflow question with @see

READ MORE ABOUT JSODC here

Related

• Javascript30 - 30 Day Vanilla JS Challenge
• Javascript Cardio - JavaScript challenges and problems

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