Data transformation exercises

Today we practice & expand upon: map, filter and find

Why? Because in JavaScript we often have to deal with arrays of objects.

In that case: Use map, filter and find! --

If we have time we will learn about another array method called reduce.

This repo has exercises with tests

• There are test files set up that check the functionality of the functions you have to write.
• Test files end with .test.js, write your code in the corresponding .js file.
• 1.map-filter-find.js are exercises to practice map, filter and find. Choose the appropriate method for each function.
• 2.data-mining.js are more advanced exercises where you have to combine different pieces of data, (gyms, trainers and pokemon) to get the information you need. That can mean nesting maps & find or chaining array methods together in a multi-step process.
• 3.reduce.js are exercises to introduce and practice reduce, one of the more powerful array methods we have (it's super effective!). These are bonus exercises.

Solutions

The solutions to these exercises can be found on the feature/solutions branch

How to do these exercises:

# Clone the repo
git clone [email protected]:TechmongersNL/dataTransformationExercises.git
# change directory
cd dataTransformationExercises
# Install dependencies
npm install
# Run the exercises
# 1.)
npm run exercise1
# 2.)
npm run exercise2
# 3.)
npm run exercise3
# all
npm run test

Running the exercises this way will make use of the --watch functionality of jest.

• That means that when you change your code, the tests will be run again (It's super ef.. well you get the idea).
• To stop running the tests you can press ctrl + c