set.contains in javascript

const mySet = new Set();

mySet.add(15);
mySet.add(33);
mySet.add(15);

for(let item of mySet) {
	console.log(item)
    // expected output: 15
	// expected output: 33
}

5
1

                                    const set = new Set();

set.add(1);
set.add(2);
set.add(3);

console.log(set.has(2));  //true
console.log(set.has(4)); //false

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