Run results for: parseInt vs toString vs string literal vs + empty string

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

add empty string to number

75.3M/s

parseInt a number

73.2M/s

string literal a number

70.3M/s

add empty string to string

60.8M/s

string literal a string

29.8M/s

toString a string

24.2M/s

toString a number

18.6M/s

parseInt a string

7.3M/s

View exact numbers

Test name	Executions per second
✓ add empty string to number	75,266,744 Ops/sec
parseInt a number	73,230,248 Ops/sec
string literal a number	70,339,408 Ops/sec
add empty string to string	60,797,772 Ops/sec
string literal a string	29,781,430 Ops/sec
toString a string	24,150,842 Ops/sec
toString a number	18,602,932 Ops/sec
parseInt a string	7,251,996 Ops/sec

Script Preparation code:

var numbers = [1, 12, 123, 1234, 12345, 123456, 1234567, 12345678, 123456789];
var strNumbers = ["1", "12", "123", "1234", "12345", "123456", "1234567", "12345678", "123456789"];

Tests:

parseInt a number
numbers.forEach(n => parseInt(n, 10));
parseInt a string
strNumbers.forEach(n => parseInt(n, 10));
toString a number
numbers.forEach(n => n.toString());
toString a string
strNumbers.forEach(n => n.toString());
string literal a number
numbers.forEach(n => `${n}`);
string literal a string
strNumbers.forEach(n => `${n}`);
add empty string to number
numbers.forEach(n => n + "");
add empty string to string
strNumbers.forEach(n => n + "");