Intermediate Algorithm Scripting - Diff Two Arrays

JavaScript
1

Tell us what’s happening:
I have a doubt with the commented part
I’m unable to figure out the use of it
I want a detailed explanation of how it is working…

Your code so far

function diffArray(arr1, arr2) {
  const result = [];
  const items = new Set([...arr1, ...arr2]);
    items.forEach(item=> {
      if(!arr1.includes(item) || !arr2.includes(item)){  //Here, what is necessity of ! operator?
      result.push(item);
      }})
      return result;
}
console.log(diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Challenge: Intermediate Algorithm Scripting - Diff Two Arrays

Link to the challenge:

2

It’s easier to explain this solution if you already have a solution of your own. Can you share your solution?

If you don’t have a solution yet, I’d start there. Reading code is an important skill,when it doesn’t really help you learn how to write code.

3

I didn’t solved it yet!

could you please explain that specific commented part for me

4

No, I don’t really enjoy explaining solutions to people when they haven’t solved the problem yet. I don’t think its very productive and I honestly don’t enjoy the process.

I’d be happy to help you work on your own code for the problem though.

5

This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.