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/98.0.4758.80 Safari/537.36

Browser: Chrome 98

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)	2839146.8 Ops/sec
Unary + (with string integer)	4118514.2 Ops/sec
parseInt (with string integer)	2859266.0 Ops/sec
Number (with string float)	1727847.9 Ops/sec
Unary + (with string float)	2230005.8 Ops/sec
parseInt (with string float)	2017246.4 Ops/sec
Number (with integer)	2992364.2 Ops/sec
Unary + (with integer)	4453533.5 Ops/sec
parseInt (with integer)	2949915.8 Ops/sec
Number (with float)	4423446.5 Ops/sec
Unary + (with float)	8399738.0 Ops/sec
parseInt (with float)	4228342.0 Ops/sec
Number (with NaN)	8784782.0 Ops/sec
Unary + (with NaN)	932609664.0 Ops/sec
parseInt (with NaN)	6834021.0 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);