Use Case Suggestion: How to Flatten array

Use Array.reduce() to get all elements inside the array and concat() to flatten them.

const flatten = arr => arr.reduce((a, v) => a.concat(v), []);
// flatten([1,[2],3,4]) -> [1,2,3,4]

[jadjoubran]

thanks to @elatfy & @kakadiadarpan 🎬 How to flatten a nested array in JavaScript

[jadjoubran]

@kakadiadarpan yeah sure! Please keep it procedural style, similarly to all the use cases on codetogo, for example: How to convert from degree to radian in JavaScript rather than creating a reusable function, simply list the steps that alow you to transform the original input (in our case [1, [2], 3, 4] into a flattened array) Even though people will eventually use it as a function, the aim of codetogo is not to push people to copy paste code, we rather want them to learn, that’s why we list instructions step by step This is also a key differentiation between other awesome repos (such as https://github.com/Chalarangelo/30-seconds-of-code)

Feel free to submit the PR even if you’re not 100% sure that it’s correct, I will help you with comments 😄 thanks for your time!