const set = new Set();

set.add(new Date());

for (let i = 0; i < 100000; i++) {
	set.add(Math.random());
}

set.add(new Date());

for (let i = 0; i < 100000; i++) {
	set.add(i*10);
}
set.add(new Date());

for (let i = 0; i < 100000; i++) {
	set.add(performance.now());
}
set.add(new Date());

const alph = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
const randChar = () => alph[Math.floor(Math.random()*alph.length)];
const randChars = (len = 6) => Array(len).fill(0).map(a => randChar()).join("");
for (let i = 0; i < 100000; i++) {
	set.add(randChars(Math.ceil(Math.random()*100)));
}

function getFirstItemOfSet(set) {
  for(let item of set) {
    if(item) {
       return item;
    }   
  }
  return undefined;
}

Teardown JS

Test cases

Test #1

Title *

Async

Code *

const first = [...set][0];

Test #2

Title *

Async

Code *

const first = set.keys().next().value;

Test #3

Title *

Async

Code *

const [first] = set;

Test #4

Title *

Async

Code *

const first = getFirstItemOfSet(set);

Test case details

Preparation Code

Test cases

Test #1

Test #2

Test #3

Test #4