OSSForks/node
1
0
Fork 0
mirror of https://github.com/zebrajr/node.git synced 2025-12-06 00:20:08 +01:00
Code Issues Actions 8 Packages Projects Releases Wiki Activity

lib: optimize priority queue

Browse Source 
PR-URL: https://github.com/nodejs/node/pull/60039
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
This commit is contained in:
Gürgün Dayıoğlu 2025-10-04 22:08:00 +02:00 committed by GitHub
parent e6cd8a21e7
commit e978a63b01
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 7 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
lib/internal/priority_queue.js
View File

@ -1,9 +1,5 @@
'use strict';
const {
Array,
} = primordials;
// The PriorityQueue is a basic implementation of a binary heap that accepts
// a custom sorting function via its constructor. This function is passed
// the two nodes to compare, similar to the native Array#sort. Crucially
@ -12,7 +8,7 @@ const {
module.exports = class PriorityQueue {
#compare = (a, b) => a - b;
#heap = new Array(64);
#heap = [undefined, undefined];
#setPosition;
#size = 0;
@ -28,9 +24,6 @@ module.exports = class PriorityQueue {
const pos = ++this.#size;
heap[pos] = value;
if (heap.length === pos)
heap.length *= 2;
this.percolateUp(pos);
}
@ -45,6 +38,7 @@ module.exports = class PriorityQueue {
percolateDown(pos) {
const compare = this.#compare;
const setPosition = this.#setPosition;
const hasSetPosition = setPosition !== undefined;
const heap = this.#heap;
const size = this.#size;
const hsize = size >> 1;
@ -62,7 +56,7 @@ module.exports = class PriorityQueue {
if (compare(item, childItem) <= 0) break;
if (setPosition !== undefined)
if (hasSetPosition)
setPosition(childItem, pos);
heap[pos] = childItem;
@ -70,7 +64,7 @@ module.exports = class PriorityQueue {
}
heap[pos] = item;
if (setPosition !== undefined)
if (hasSetPosition)
setPosition(item, pos);
}
@ -78,6 +72,7 @@ module.exports = class PriorityQueue {
const heap = this.#heap;
const compare = this.#compare;
const setPosition = this.#setPosition;
const hasSetPosition = setPosition !== undefined;
const item = heap[pos];
while (pos > 1) {
@ -86,13 +81,13 @@ module.exports = class PriorityQueue {
if (compare(parentItem, item) <= 0)
break;
heap[pos] = parentItem;
if (setPosition !== undefined)
if (hasSetPosition)
setPosition(parentItem, pos);
pos = parent;
}
heap[pos] = item;
if (setPosition !== undefined)
if (hasSetPosition)
setPosition(item, pos);
}