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/90.0.4430.85 Safari/537.36

Browser: Chrome 90

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Number (with string integer)	2385036.2 Ops/sec
Unary + (with string integer)	3464843.0 Ops/sec
parseInt (with string integer)	2095198.0 Ops/sec
Number (with string float)	1101728.9 Ops/sec
Unary + (with string float)	1417129.2 Ops/sec
parseInt (with string float)	1340877.1 Ops/sec
Number (with integer)	2172157.5 Ops/sec
Unary + (with integer)	3121815.5 Ops/sec
parseInt (with integer)	2355905.5 Ops/sec
Number (with float)	3310808.5 Ops/sec
Unary + (with float)	6082285.0 Ops/sec
parseInt (with float)	3705181.5 Ops/sec
Number (with NaN)	8047964.5 Ops/sec
Unary + (with NaN)	627683776.0 Ops/sec
parseInt (with NaN)	5626964.0 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);