Run results for: var is a non-empty array

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/114.0

Browser: Firefox 114

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
IsArray (array)	89660096.0 Ops/sec
IsArray (null)	109286960.0 Ops/sec
typecheck (nullable dot) (array)	376696800.0 Ops/sec
typecheck (nullable dot) (null)	464503296.0 Ops/sec
manual check cond (array)	413524704.0 Ops/sec
manual check cond (null)	701773504.0 Ops/sec
typeof obj + length (array)	403856672.0 Ops/sec
typeof obj + length (null)	709874048.0 Ops/sec

Script Preparation code:

var arr = [1,2,3];
var notArr = null;

Tests:

IsArray (array)
Array.isArray(arr) && arr.length > 0
IsArray (null)
Array.isArray(notArr) && notArr.length > 0
typecheck (nullable dot) (array)
arr?.length > 0
typecheck (nullable dot) (null)
notArr?.length > 0
manual check cond (array)
arr !== null && arr !== undefined && arr.length > 0
manual check cond (null)
notArr !== null && notArr !== undefined && notArr.length > 0
typeof obj + length (array)
typeof arr === 'object' && arr !== null && arr.length > 0
typeof obj + length (null)
typeof notArr === 'object' && notArr !== null && notArr.length > 0