Please have a look at the below script. I am testing it with Chrome.

/*declare a new set*/

var items = new Set()



/*add an array by declaring as array type*/

var arr = [1,2,3,4];

items.add(arr);



/*print items*/

console.log(items); // Set {[1, 2, 3, 4]}



/*add an array directly as argument*/

items.add([5,6,7,8]);



/*print items*/

console.log(items); // Set {[1, 2, 3, 4], [5, 6, 7, 8]}



/*print type of items stored in Set*/

for (let item of items) console.log(typeof item); //object, object



/*check if item has array we declared as array type*/

console.log(items.has(arr)); // true



/*Now, check if item has array we added through arguments*/

console.log(items.has([5,6,7,8])); //false



/*Now, add same array again via argument*/

items.add([1,2,3,4]);



/*Set has duplicate items*/

console.log(items); // Set {[1, 2, 3, 4], [5, 6, 7, 8], [1, 2, 3, 4]}

1. Why it is returning false at items.has([5,6,7,8])?


2. Why it is allowing duplicate values? I thought A set is in an ordered list of values that cannot contain duplicates


3. How to access array added by items.add([5,6,7,8])?