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/119.0.0.0 Safari/537.36 Edg/119.0.0.0

Browser: Chrome 119

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

string literal a number

16.2M/s

add empty string to number

15.9M/s

add empty string to string

14.7M/s

string literal a string

11.3M/s

toString a string

10.3M/s

toString a number

9.1M/s

parseInt a number

957K/s

parseInt a string

793K/s

View exact numbers

Test name	Executions per second
✓ string literal a number	16,161,820 Ops/sec
add empty string to number	15,937,532 Ops/sec
add empty string to string	14,694,066 Ops/sec
string literal a string	11,286,939 Ops/sec
toString a string	10,337,150 Ops/sec
toString a number	9,057,428 Ops/sec
parseInt a number	956,665 Ops/sec
parseInt a string	793,111 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 + "");