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JavaScript - how to check if array is empty?

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Using JavaScript it is possible to check if array is empty in 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


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