Benchmark: array check vs string check

Script Preparation code:

const a = [1];
const b = 'hello';

Tests:

isArray
const a = [1]; if (Array.isArray(a)) { return true; }
typeof String
const b = 'hello'; if (typeof b === 'string') { return true; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isArray
typeof String

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; Android 12; M2102J20SG) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.5481.192 Mobile Safari/537.36 OPR/74.1.3922.71199

Browser/OS: Opera Mobile 74 on Android

View result in a separate tab

Test name	Executions per second
isArray	5435680.0 Ops/sec
typeof String	1360583000.0 Ops/sec

array check vs string check (version: 0)

What's faster, checking if a variable is an array or a string?

Comparing performance of: isArray vs typeof String

Created: one year ago by: Guest

Jump to the latest result

isArray

typeof String

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A