Need help with "Find Symmetric Difference"

[swanand7731]

Need help with this solution, this is giving me the correct solution, however, this is failing the test on FCC, can someone help?

Unable to come to a solution (don’t want to look at hints too early)

function sym(...args) {
const mySet = new Set();
for(let arr of args){
  for(let elem of arr){
    if(mySet.has(elem)){
      mySet.delete(elem)
    }else{
      mySet.add(elem)
    }
  } 
}
let retArr = Array.from(mySet);
return retArr.sort();
}

sym([1, 2, 3], [5, 2, 1, 4]);

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.82 Safari/537.36

Challenge: Find the Symmetric Difference

Link to the challenge:

freeCodeCamp.org

[JeremyLT]

@swanand7731

Tell us what’s happening:
Describe your issue in detail here.

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Hello there.

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It doesn’t look like your code produces the correct results:

function sym(...args) {
  const mySet = new Set();
  for (let arr of args) {
    for (let elem of arr) {
      if (mySet.has(elem)) {
        mySet.delete(elem);
      } else {
        mySet.add(elem);
      }
    }
  }
  const retArr = Array.from(mySet);
  return retArr.sort();
}

/// sym([1, 2, 3, 3], [5, 2, 1, 4]) should return [3, 4, 5].
console.log(sym([1, 2, 3, 3], [5, 2, 1, 4]));