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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.6

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
parseInt a number	2100009.2 Ops/sec
parseInt a string	1611489.1 Ops/sec
toString a number	3988523.5 Ops/sec
toString a string	15098165.0 Ops/sec
string literal a number	7965150.0 Ops/sec
string literal a string	18365432.0 Ops/sec
add empty string to number	5303732.0 Ops/sec
add empty string to string	9624666.0 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 + "");

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

parseInt a number

parseInt a string

toString a number

toString a string

string literal a number

string literal a string

add empty string to number

add empty string to string