Run results for: Array isArray vs typeof vs array || [] - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:144.0) Gecko/20100101 Firefox/144.0

Browser: Firefox 144

Operating system: Linux

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
typeof	142183328.0 Ops/sec
isArray	26266942.0 Ops/sec
array \|\| []	115430064.0 Ops/sec
instanceOf	27285526.0 Ops/sec

Script Preparation code:

var test = [1,2,3,4];
var c;

Tests:

typeof
if (typeof test === 'object') { c++; }
isArray
if (Array.isArray(test)) { c++; }
array || []
if (test || []) { c++; }
instanceOf
if (test instanceof Array) { c++; }