Quick Reference
The DOMTokenList forEach() method executes a callback function for each token in a DOMTokenList, which is a set of space-separated tokens that can be accessed by index.
<!-- html element to place output -->
<p id="my_output" class="class1 class2 class3"></p>// variables
let my_classes = document.getElementById('my_output').classList;
let my_list = '';
// loop through the tokens
my_classes.forEach(
function(token, index) {
my_list += 'Token ' + index + ': ' + token + '<br>';
}
);
// output to the HTML element
document.getElementById('my_output').innerHTML = my_list;Output
Token 0: class1
Token 1: class2
Token 2: class3Note
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.
Syntax
nodelist.forEach(function(currentValue, index, arr), thisValue)Parameters
| Parameter | Return Types |
|---|---|
| function | A function to run for each token (required) |
| currentValue | The value of the current token (required) |
| index | The index of the current token |
| arr | The NodeList of the current token |
| thisValue | A value passed to the function as its "this" value (default is undefined) |
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.