Run results for: Number constructor vs unary plus vs parseInt

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/122.0.6261.62 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 122

Operating system: iOS 17.3

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
✓ Unary + (with NaN)	192,085,632 Ops/sec
parseInt (with NaN)	19,079,310 Ops/sec
Unary + (with float)	18,604,116 Ops/sec
Number (with NaN)	17,893,268 Ops/sec
parseInt (with float)	9,866,893 Ops/sec
Number (with float)	8,369,838 Ops/sec
Unary + (with string integer)	8,227,985 Ops/sec
Unary + (with string float)	7,012,830 Ops/sec
parseInt (with integer)	7,006,746 Ops/sec
Unary + (with integer)	6,772,040 Ops/sec
Number (with string integer)	5,931,248 Ops/sec
parseInt (with string integer)	5,868,448 Ops/sec
parseInt (with string float)	5,456,702 Ops/sec
Number (with integer)	5,364,293 Ops/sec
Number (with string float)	5,269,336 Ops/sec

Test name

Executions per second

✓ Unary + (with NaN)

192,085,632 Ops/sec

parseInt (with NaN)

19,079,310 Ops/sec

Unary + (with float)

18,604,116 Ops/sec

Number (with NaN)

17,893,268 Ops/sec

parseInt (with float)

9,866,893 Ops/sec

Number (with float)

8,369,838 Ops/sec

Unary + (with string integer)

8,227,985 Ops/sec

Unary + (with string float)

7,012,830 Ops/sec

parseInt (with integer)

7,006,746 Ops/sec

Unary + (with integer)

6,772,040 Ops/sec

Number (with string integer)

5,931,248 Ops/sec

parseInt (with string integer)

5,868,448 Ops/sec

parseInt (with string float)

5,456,702 Ops/sec

Number (with integer)

5,364,293 Ops/sec

Number (with string float)

5,269,336 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);