4geeksacademy / javascript-arrays-exercises-tutorial

Dozens of looping exercises to sharpen your looping skills with for, forEach, map, filter, looping a dictionary, looping bidimensional arrays, adding conditions to loops, finding an element, and more!

Looping in JavaScript Tutorial & Exercises

By @alesanchezr and other contributors at 4Geeks Academy

Estas instrucciones están disponibles en 🇪🇸 español 🇪🇸

Dozens of looping exercises to sharpen your looping skills with for, forEach, map, filter, looping an object, looping bidimentional arrays, adding conditions to loops, finding an element, and more!

Before you start... some related tutorials:

1. JavaScript for Beginners
2. Looping with JavaScript ← 🔥 You are here
3. JavaScript Functions
4. Master JavaScript

We need you! These exercises are built and maintained in collaboration with contributors such as yourself. If you find any bugs or misspellings, please contribute and/or report them.

One click installation (recommended):

You can open these exercises in just a few seconds by clicking: Open in Codespaces (recommended) or Open in Gitpod.

Once you have opened VSCode, the LearnPack exercises should start automatically. If exercises don't run automatically, you can try typing on your terminal: $ learnpack start

Local Installation

Clone the repository in your local environment and follow the steps below:

1. Install LearnPack, the package manager for learning tutorials and the node compiler plugin for LearnPack, make sure you also have node.js 14+:

$ npm i learnpack -g
$ learnpack plugins:install learnpack-node

2. Start the tutorial/exercises by running the following command at the same level where your learn.json file is:

$ npm i [email protected] -g
$ learnpack start

How are the exercises organized?

Each exercise is a small React application containing the following files:

1. app.js: represents the entry JavaScript file that will be executed by the computer.
2. README.md: contains exercise instructions.
3. test.js: contains the testing script for the exercise (you don't have to open this file).

Note: The exercises have automatic grading, but it's very rigid and strict, my recommendation is to not take the tests too serious and use them only as a suggestion, or you may get frustrated.

Contributors

Thanks to these wonderful people (emoji key):

1. Alejandro Sanchez (alesanchezr), contribution: (coder) 💻 (idea) 🤔, (build-tests) ⚠️ , (pull-request-review) 👀 (build-tutorial) ✅ (documentation) 📖

2. Paolo (plucodev), contribution: (bug reports) 🐛, (coder) 💻, (translation) 🌎

This project follows the all-contributors specification. Contributions of any kind are welcome!

This and many other exercises are built by students as part of the 4Geeks Academy Coding Bootcamp by Alejandro Sánchez and many other contributors. Find out more about our Full Stack Developer Course, and Data Science Bootcamp.

javascript-arrays-exercises-tutorial's Issues

Array exercise

i keep on on getting the same issue when i want to work on JS..

Wrong description in the exercise 19, expected result is not matching the test

https://github.com/4GeeksAcademy/javascript-arrays-exercises-tutorial/tree/master/exercises/19-And-One-and-a-Two-and-a-Three

This is causing a lot of frustrations in the students.

Exercise 14, issue with tests

Given the following function:

function mergeTwoList(arr){
    let even = [];
    let odd = [];
    for(let i=0; i<list_of_numbers.length; i++){
        if(list_of_numbers[i]%2===0){
            even.push(list_of_numbers[i]);
        }else{
            odd.push(list_of_numbers[i]);
        }
    }
    return odd.concat(even);
}

When you build, the answers and lengths match expected result perfectly. Tests 3 to 5, however, are failing.

I took a look at the unit tests themselves and they appear to be written correctly and with no issues.

This may be an issue with learnpack compilation/testing.