mirror of
https://github.com/alrayyes/wiki.git
synced 2024-11-22 19:46:23 +00:00
38 lines
900 B
Markdown
38 lines
900 B
Markdown
|
---
|
||
|
|
id: fd03be0e-a4c0-421f-9dd7-1bddc9dece65
|
||
|
|
title: JavaScript Prototypes
|
||
|
|
---
|
||
|
|
|
||
|
|
# Description
|
||
|
|
|
||
|
|
A prototype can be seen as an [object](20200826201605-objects) another
|
||
|
|
object extends.
|
||
|
|
|
||
|
|
# Syntax
|
||
|
|
|
||
|
|
``` javascript
|
||
|
|
let protoRabbit = {
|
||
|
|
speak(line) {
|
||
|
|
console.log(`The ${this.type} rabbit says '${line}'`); // : The killer rabbit says 'SKREEEE!'
|
||
|
|
},
|
||
|
|
};
|
||
|
|
let killerRabbit = Object.create(protoRabbit);
|
||
|
|
killerRabbit.type = "killer";
|
||
|
|
killerRabbit.speak("SKREEEE!");
|
||
|
|
```
|
||
|
|
|
||
|
|
# Object.prototype
|
||
|
|
|
||
|
|
Most objects in JavaScript eventually extend `Object.prototype` through
|
||
|
|
parent prototype objects or directly, which provides a bunch of default
|
||
|
|
methods[^1].
|
||
|
|
|
||
|
|
``` javascript
|
||
|
|
console.log(Object.getPrototypeOf({}) == Object.prototype); // true
|
||
|
|
console.log(Object.getPrototypeOf(Object.prototype)); // null
|
||
|
|
```
|
||
|
|
|
||
|
|
# Footnotes
|
||
|
|
|
||
|
|
[^1]: <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object>
|