Upon traversing the prototype chain, one would expect to find Object.prototype at the bottom (or top?), leading to the assumption that they would function like typical objects. However, when using Object.getOwnPropertyDescriptors, the properties obtained do not match those visible when inspecting the object through console.dir. How can this discrepancy exist?
for (let property of Object.keys(Object.getOwnPropertyDescriptors(document))) {
console.log(property)
}Great query! The reason for this lies in the fact that many of the attributes on HTMLElement are actually prototype functions acting as getters and setters.
There's a complex process at work in the DOM that transforms the almost-English
document.body.style = 'background: pink;'HTMLElement elements, helping to optimize memory usage.
For instance:
// Class utilizing prototype getter
class Thing {
constructor() {
this.year = new Date().getFullYear()
}
get time() {
return Date.now();
}
}
console.dir(new Thing());
// > Displays a JSON representation containing `Thing#time` and `Thing#year`
console.log(Object.getOwnPropertyDescriptors(new Thing()));
/*
> Outputs an object with *only* the `#year` descriptor
because `#time` is a prototype function, not a property
*/
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