How Can I Determine if a JavaScript Variable is an Array?

Determining Array Variables in JavaScript

To ascertain whether a JavaScript variable represents an array, consider employing the following approaches:

Constructor Property Check:

This approach, as you've mentioned, involves utilizing the constructor property:

if (variable.constructor === Array)

Array.isArray():

The Array.isArray() method provides a straightforward way to check for arrays:

Array.isArray(variable)

Instanceof Operator:

You can also use the instanceof operator, which checks if a variable is an instance of a particular type:

variable instanceof Array

Object.prototype.toString.call():

This method can be employed to determine the type of a variable, including arrays:

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

For optimal performance, the variable.constructor === Array method is recommended. However, all these approaches offer reliable ways to check for arrays in JavaScript.

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