Run results for: Native JS: concatenate integer with string with + vs template literals vs String.concat

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

using plus operator

860K/s

using template literals

48K/s

using concat function

21K/s

View exact numbers

Script Preparation code:

const count = 10000;

Tests:

using plus operator
for (let i = 0; i < count; ++i) { let result = i result += 'px'; }
using concat function
for (let i = 0; i < count; ++i) { let result = i result = ''.concat(result, 'px'); }
using template literals
for (let i = 0; i < count; ++i) { let result = i result = `${result}px`; }