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Extract map of final values into change event

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Cached on first use for performance and more DRY
This commit is contained in:
Talia 2023-09-20 13:26:14 +02:00
parent d62136e180
commit 6542047b7c
1 changed files with 9 additions and 2 deletions
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11
state.js
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@ -1,8 +1,15 @@
export class ChangeEvent extends Event { export class ChangeEvent extends Event {
#final
constructor(...changes) { constructor(...changes) {
super('change') super('change')
this.changes = changes this.changes = changes
} }
get final() {
if (!this.#final) {
this.#final = new Map(changes)
}
return this.#final
}
} }
export class MapStorage extends Storage { export class MapStorage extends Storage {
@ -50,8 +57,8 @@ export class State extends EventTarget {
// Try running a "<name>Changed" method for every changed property // Try running a "<name>Changed" method for every changed property
// Can be disabled to maybe squeeze out some performance // Can be disabled to maybe squeeze out some performance
if (options.methods ?? true) { if (options.methods ?? true) {
this.addEventListener("change", ({changes}) => { this.addEventListener("change", ({final}) => {
new Map(changes).forEach((value, prop) => { final.forEach((value, prop) => {
if (`${prop}Changed` in this) this[`${prop}Changed`](value) if (`${prop}Changed` in this) this[`${prop}Changed`](value)
}) })
}) })