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- Categories: JavaScript Properties, JavaScript Reference, Reference
Last Updated on November 14, 2022
Quick Reference
The Array.prototype property allows new properties and methods to be added to existing arrays.
<!-- html element to place output -->
<p id="my_cars"></p>
// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];
// add new method
Array.prototype.my_upper_case = function() {
for (let i = 0; i < this.length; i++) {
this[i] = this[i].toUpperCase();
}
};
// use new method on array
cars.my_upper_case();
//output to HTML element
document.getElementById('my_cars').innerHTML = cars;
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
LAMBORGHINI,FERRARI,MASERATI,ALFA ROMEO
Syntax
Array.prototype.name = value
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.
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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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