Write a JavaScript function to check whether an 'input' is an array or not

JavaScript Conversations
#1

Write a JavaScript function to check whether an ‘input’ is an array or not.

Test Data:
console.log(is_array(‘w3resource’));
console.log(is_array([1, 2, 4, 0]));

sample output:
false
true

#2 
var is_array = function(input) {
  if (toString.call(input) === "[object Array]")
    return true;
  return false;   
    };
console.log(is_array('w3resource'));
console.log(is_array([1, 2, 4, 0]));

Sample Output:

false
true