Check if value is an array or not in javascript

is_array.js

// typeof  operator reports arrays as 'object' 
// this function can be used to determine if the value is an array or not.

var is_array = function (value) {
    return Object.prototype.toString.apply(value) === '[object Array]';
};

var ar1 = ['abc', 'def', 'hij']; // array
var ob1 = {'0': 'abc', '1': 'def', '2': 'hij'}; // object
var va1 = 'abcdefhij'; // string

console.log(is_array(ar1)); // true
console.log(is_array(ob1)); // false
console.log(is_array(va1)); // false