how to check if variable is array in javascript

Array.isArray(variableName)var data = ['a', 'b', 'c']
var isArray = Array.isArray(data)
console.log(isArray)// If you want to test if a variable (object) is an instance of 
// an array. You can use the Array.isArray(varName) method
// this method takes one argument, the variable or object you want to test
// and returns true, if the argument is an array 
// or false, if the argument is not an array

if (Array.isArray(object)) {
	// is true
} else {
	// is false
}

Array.isArray([1, 2, 3, 4]); // Returns true
Array.isArray(4); // returns false
// this could be used for flattening an array of arrays
var fruits = ["Banana", "Orange", "Apple", "Mango"];

var n = fruits.includes("Mango");