Run results for: Number constructor vs unary plus vs parseInt

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Browser: Chrome 91

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Number (with string integer)	3219230.8 Ops/sec
Unary + (with string integer)	4605560.0 Ops/sec
parseInt (with string integer)	3252123.8 Ops/sec
Number (with string float)	1648379.2 Ops/sec
Unary + (with string float)	2161755.8 Ops/sec
parseInt (with string float)	1950424.0 Ops/sec
Number (with integer)	3476380.0 Ops/sec
Unary + (with integer)	5353617.5 Ops/sec
parseInt (with integer)	3331215.0 Ops/sec
Number (with float)	5152656.5 Ops/sec
Unary + (with float)	9780863.0 Ops/sec
parseInt (with float)	5009050.5 Ops/sec
Number (with NaN)	10995375.0 Ops/sec
Unary + (with NaN)	828804416.0 Ops/sec
parseInt (with NaN)	6770004.0 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);