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Check if value is array in JavaScript

javascript

instanceof Array

;[] instanceof Array // true
'test' instanceof Array // false

Array.isArray

As of ES5 there is now also:

Array.isArray([]) // true
Array.isArray('test') // false
Array.isArray({}) // false

.constructor === Array

;[].constructor === Array // true
'foo'.constructor === Array // false

From Stack Overflow