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Check if value is array in JavaScript

javascript
On this page
  • instanceof Array
  • Array.isArray
  • .constructor === Array

instanceof Array

js
[] instanceof Array     // true
"test" instanceof Array // false

Array.isArray

As of ES5 there is now also:

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

.constructor === Array

js
[].constructor === Array    // true
"foo".constructor === Array // false

From Stack Overflow

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