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Posted on Apr 17

Daily JavaScript Challenge #JS-155: Flatten Deeply Nested Arrays

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Daily JavaScript Challenge: Flatten Deeply Nested Arrays

Hey fellow developers! 👋 Welcome to today's JavaScript coding challenge. Let's keep those programming skills sharp!

The Challenge

Difficulty: Medium

Topic: Array Manipulation

Description

Write a function that takes a deeply nested array of integers and returns a completely flattened array. The nested arrays can have any depth.

Ready to Begin?

https://www.dpcdev.com/

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Write your solution
Test it against the provided test cases
Share your approach in the comments below!

Want to Learn More?

Check out the documentation about this topic here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray

Join the Discussion!

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Did you find any interesting edge cases?
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This is part of our Daily JavaScript Challenge series. Follow me for daily programming challenges and let's grow together! 🚀

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Top comments (1)

Massimo Artizzu • Apr 18

const flatten = array => array.flat(Infinity);

Jokes aside... The easiest one would be recursive:

const flatten = array => {
  const flattened = [];
  for (const item of array) {
    if (Array.isArray(item)) {
      for (const subitem of flatten(item)) {
        flattened.push(subitem);
      }
    } else flattened.push(item);
  }
  return flattened;
};

Next step: instead of Array.isArray, use this:

const isIterable = item => !!item && Symbol.iterator in item;

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