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Optimise iterating through tiddlers

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Astonishingly, it’s much quicker to use `Object.keys()` to get an array
of key names, and then iterate through that. I’m seeing 25% speed
improvements for an empty tiddler iterator.
This commit is contained in:
Jermolene 2015-07-08 08:27:28 +01:00
parent 8bfc6f3557
commit 8f63e2a959
1 changed files with 22 additions and 6 deletions
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28
boot/boot.js
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@ -910,7 +910,10 @@ $tw.Wiki = function(options) {
// Iterate through all tiddler titles
this.each = function(callback) {
for(var title in tiddlers) {
var titles = Object.keys(tiddlers),
index,titlesLength,title;
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
callback(tiddlers[title],title);
}
};
@ -922,7 +925,10 @@ $tw.Wiki = function(options) {
// Iterate through all shadow tiddler titles
this.eachShadow = function(callback) {
for(var title in shadowTiddlers) {
var titles = Object.keys(shadowTiddlers),
index,titlesLength,title;
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
var shadowInfo = shadowTiddlers[title];
callback(shadowInfo.tiddler,title);
}
@ -930,10 +936,15 @@ $tw.Wiki = function(options) {
// Iterate through all tiddlers and then the shadows
this.eachTiddlerPlusShadows = function(callback) {
for(var title in tiddlers) {
var titles = Object.keys(tiddlers),
index,titlesLength,title;
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
callback(tiddlers[title],title);
}
for(var title in shadowTiddlers) {
titles = Object.keys(shadowTiddlers);
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
if(!Object.prototype.hasOwnProperty.call(tiddlers,title)) {
var shadowInfo = shadowTiddlers[title];
callback(shadowInfo.tiddler,title);
@ -943,7 +954,10 @@ $tw.Wiki = function(options) {
// Iterate through all the shadows and then the tiddlers
this.eachShadowPlusTiddlers = function(callback) {
for(var title in shadowTiddlers) {
var titles = Object.keys(shadowTiddlers),
index,titlesLength,title;
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
if(Object.prototype.hasOwnProperty.call(tiddlers,title)) {
callback(tiddlers[title],title);
} else {
@ -951,7 +965,9 @@ $tw.Wiki = function(options) {
callback(shadowInfo.tiddler,title);
}
}
for(var title in tiddlers) {
titles = Object.keys(tiddlers);
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
if(!Object.prototype.hasOwnProperty.call(shadowTiddlers,title)) {
callback(tiddlers[title],title);
}