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; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

add empty string to number

52.9M/s

parseInt a number

51.2M/s

add empty string to string

49.0M/s

string literal a string

34.0M/s

toString a string

16.2M/s

parseInt a string

3.3M/s

string literal a number

3.0M/s

toString a number

2.9M/s

View exact numbers

Test name	Executions per second
✓ add empty string to number	52,905,184 Ops/sec
parseInt a number	51,220,460 Ops/sec
add empty string to string	49,049,172 Ops/sec
string literal a string	34,007,448 Ops/sec
toString a string	16,162,310 Ops/sec
parseInt a string	3,280,133 Ops/sec
string literal a number	3,008,245 Ops/sec
toString a number	2,852,389 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 + "");