Benchmark: startsWith vs indexOf with Array.filter for user dataset

Script Preparation code:

// Array to hold the generated user data
var users = [];

// Function to generate random user data
function generateUserData() {
  const names = ['John', 'Jane', 'Mike', 'Emily', 'David', 'Sarah', 'Chris', 'Jessica', 'Mark', 'Lisa'];
  const lastNames = ['Smith', 'Johnson', 'Williams', 'Brown', 'Jones', 'Miller', 'Davis', 'Garcia', 'Rodriguez', 'Wilson'];
  const cities = ['New York', 'Los Angeles', 'Chicago', 'Houston', 'Phoenix', 'Philadelphia', 'San Antonio', 'San Diego', 'Dallas', 'San Jose'];
  
  const name = names[Math.floor(Math.random() * names.length)];
  const lastName = lastNames[Math.floor(Math.random() * lastNames.length)];
  const age = Math.floor(Math.random() * 60) + 18; // Random age between 18 and 77
  const city = cities[Math.floor(Math.random() * cities.length)];
  
  return {
    name,
    lastName,
    age,
    city,
  };
}

for (let i = 0; i < 500; i++) {
  const user = generateUserData();
  users.push(user);
}

Tests:

indexOf
const usersInSanCities = users.filter(user => user.city.indexOf('San') === 0)
startsWith
const usersInSanCities = users.filter(user => user.city.startsWith('San'))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
startsWith

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 12 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36

Browser/OS: Chrome 113 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
indexOf	148867.5 Ops/sec
startsWith	521624.7 Ops/sec

startsWith vs indexOf with Array.filter for user dataset (version: 0)

Comparing performance of: indexOf vs startsWith

Created: 12 days ago by: Guest

Jump to the latest result

indexOf

startsWith

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A