is_array() function for Javascript

To check whether variable array or not need to use type check syntax: instanceof:

[] instanceof Array // true
'string' instanceof Array // false

You can make a function to incapsulate the feature:

function is_array(variable) {
	return variable instanceof Array
}

Using:

is_array([]) // true
is_array('string') // false

jQuery also has the similar function:

$.isArray([]) // true
$.isArray('string')

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