- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The Array includes() method returns true if an array contains a specified value, and returns false if the value is not found.
<!-- html element to place output -->
<p id='my_cars'></p>
// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];
// look for Maserati starting from index position 2
document.getElementById('my_cars').innerHTML = 'Found: ' + cars.includes('Maserati', 2);
The way this works (see Syntax section below):
- The includes() method cycles through the array from a specified starting position (in this case 2) looking for a specified value (Maserati); if found, it will return true; if not, it will return false
Output
Found: true
Syntax
array.includes(element, start)
Parameters
| Parameter | Description |
|---|---|
| element | The value to search for (required) |
| start | Start position (default is 0) |
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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)
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