Quick Reference
The Array.isArray() method tests an object to determine if it’s an array. It returns true if an object is an array and false if the object is not.
<!-- html element to place output -->
<p id='my_cars'></p>// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];
// test if an array
let is_array = Array.isArray(cars);
// output results to HTML element
document.getElementById('my_cars').innerHTML = 'Is this an array: ' + is_array;Note
Arrays count starting from zero NOT one. So item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on.
Output
Is this an array: trueSyntax
Array.isArray(obj)Parameters
| Parameter | Description |
|---|---|
| obj | An object to be tested (required) |
JavaScript Notes:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.