The Array length property sets or returns the number of elements in an array.

<!-- html element to place output -->
<p id="my_cars"></p>

Getting the Length:

// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];

// get length
let cars_length =  cars.length;

//output constructor
document.getElementById('my_cars').innerHTML = 'Length: ' + cars_length;

Setting the Length:

// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];

// set length (changes the length of the existing array)
cars.length = 2;

//output constructor
document.getElementById('my_cars').innerHTML = 'Length: ' + cars_length;

Getting the Length:

Length: 4

Setting the Length:

Length: 2

Getting the Length:

array.length

Setting the Length:

array.length = number

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