Run results for: Set vs array.includes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Windows

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
new Set(...)	19696.7 Ops/sec
array.includes	47255.2 Ops/sec

Tests:

new Set(...)

const strings = ['russia', 'usa', 'russia', 'france', 'russia', 'spain'];
let result = [];

for(let i = 0; i < 100; ++i) {
  const cities = strings.reduce((acc, item) => {
  	return [...acc, item];
  }, []);
  
  [...new Set(cities)];
}

​x
 
const strings = ['russia', 'usa', 'russia', 'france', 'russia', 'spain'];let result = [];​for(let i = 0; i < 100; ++i) {  const cities = strings.reduce((acc, item) => {    return [...acc, item];  }, []);    [...new Set(cities)];}​

array.includes

const strings = ['russia', 'usa', 'russia', 'france', 'russia', 'spain'];

for(let i = 0; i < 100; ++i) {
  const cities = strings.reduce((acc, item) => {
    if (!acc.includes(item)) {
		return [...acc, item];
    }
    
  	return acc;
  }, []);
}

 
const strings = ['russia', 'usa', 'russia', 'france', 'russia', 'spain'];​for(let i = 0; i < 100; ++i) {  const cities = strings.reduce((acc, item) => {    if (!acc.includes(item)) {        return [...acc, item];    }        return acc;  }, []);}​