Run results for: Number constructor vs unary plus vs parseInt

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36

Browser: Chrome 101

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Number (with string integer)	4464477.0 Ops/sec
Unary + (with string integer)	6445888.0 Ops/sec
parseInt (with string integer)	4434990.0 Ops/sec
Number (with string float)	2713721.0 Ops/sec
Unary + (with string float)	3379417.0 Ops/sec
parseInt (with string float)	3169871.0 Ops/sec
Number (with integer)	4634109.0 Ops/sec
Unary + (with integer)	6890380.0 Ops/sec
parseInt (with integer)	4531309.0 Ops/sec
Number (with float)	6985395.0 Ops/sec
Unary + (with float)	13020450.0 Ops/sec
parseInt (with float)	6707501.0 Ops/sec
Number (with NaN)	14612920.0 Ops/sec
Unary + (with NaN)	1025933000.0 Ops/sec
parseInt (with NaN)	11372820.0 Ops/sec

Tests:

Number (with string integer)
var numberStrInt = Number(Math.floor(1000 * Math.random()).toString());
Unary + (with string integer)
var unaryStrInt = +Math.floor(1000 * Math.random()).toString();
parseInt (with string integer)
var parseStrInt = parseInt(Math.floor(1000 * Math.random()).toString(), 10);
Number (with string float)
var numberStrFloat = Number((1000 * Math.random()).toString());
Unary + (with string float)
var unaryStrFloat = +(1000 * Math.random()).toString();
parseInt (with string float)
var parseStrFloat = parseInt((1000 * Math.random()).toString(), 10);
Number (with integer)
var numberNumInt = Number(Math.floor(1000 * Math.random()));
Unary + (with integer)
var unaryNumInt = +Math.floor(1000 * Math.random());
parseInt (with integer)
var parseNumInt = parseInt(Math.floor(1000 * Math.random()), 10);
Number (with float)
var numberNumFloat = Number(1000 * Math.random());
Unary + (with float)
var unaryNumFloat = +(1000 * Math.random());
parseInt (with float)
var parseNumFloat = parseInt((1000 * Math.random()), 10);
Number (with NaN)
var numberNaN = Number("hello");
Unary + (with NaN)
var unaryNaN = +("hello");
parseInt (with NaN)
var parseNaN = parseInt("hello", 10);