JavaScript - check if array is empty

Using JavaScript it is possible to check if an array is empty in the following way.

1. Custom function example

Note: Array.isArray(array) method can be useful too to check if varialbe is array type.

// ONLINE-RUNNER:browser;

var array1 = [ ];
var array2 = [1, 2, 3];
var array3 = [false];
var array4 = [function() { return false; }];
var array5 = [{result: false}];

console.log(array1.length == 0); // true
console.log(array2.length == 0); // false
console.log(array3.length == 0); // false
console.log(array4.length == 0); // false
console.log(array5.length == 0); // false

Output:

true
false
false
false
false