Can't go further Diff Two Arrays

JavaScript
1

Tell us what’s happening:

Your code so far

function diffArray(arr1, arr2) {
  var newArr = [];
  
  
  // Same, same; but different.
//   for(var i = arr1[i]; i <= arr1.length - 1; i++) {
    
//     for(var j = arr2[j]; j <= arr2.length - 1;j++ ) {
//        arr1[i] == arr2[j] ? "next" : newArr.push(arr1[i]);
//     }
      
//   }
  
  
    for (var i =0; i <= arr2.length - 1;i++) {
     arr1[0].indexOf(arr2[i]) > -1 || arr2.indexOf(arr1[i]) newArr.push(arr1[i]) : newArr.push(arr2[i]);
      
    }

  
  return newArr;
}

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

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Link to the challenge:

3

let me explain in this code, this one a little bit correct one ;

  var newArr = [];
  
  
    for (var i =0; i <= arr2.length - 1;i++) {
     if(arr1[0].indexOf(arr2[i])>-1) {
                        //here I want to check if arr1 is equal to arr2, if not will give array
    return newArr.push(arr2[i]);
       
     }if else( arr2[0].indexOf(arr1[i])>-1) {
       
       return newArr.push(arr1[i]);
       
     }
      
    }

  
  return newArr;
}

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