How to check if a variable is an array in JavaScript?

isArray

Array.isArray(variable)

instanceof vs. Array.isArray() (opens in a new tab)

When checking for Array instance, Array.isArray() is preferred over instanceof because it works across realms.

instanceof

variable instanceof Array

constructor

variable.constructor === Array

Object.prototype.toString()

Object.prototype.toString.call(variable) === '[object Array]'

References

• How to check if Variable is an Array in JavaScript | SamanthaMing.com (opens in a new tab)
• How to check if a variable is an array in JavaScript? - GeeksforGeeks (opens in a new tab)
• How do I check if a variable is an array in JavaScript? - Stack Overflow (opens in a new tab)
• Array.isArray() - JavaScript | MDN (opens in a new tab)