When it comes to iterating over a set of documents stored in MongoDB from my Meteor app, I have two options:
db.collection.find( ... ).forEach( function f( doc ){ ... })
or
var docs = db.collection.find( ... ).fetch();
_.each( docs, function f( doc ){ ... }); // using underscore.js
Which method is more preferable for performance? What are the pros and cons of each choice?
Both methods essentially perform the same function at the core API level, which involves retrieving the cursor and transforming the results. However, there is a key difference in terms of performance:
.forEach() processes the cursor results one by one, executing the provided iterator function for each.
.fetch(), on the other hand, retrieves the entire "array" from the cursor all at once, storing it all in memory in a single operation.
Ultimately, neither method is inherently "faster" at the core operation of fetching data from the cursor. However, not having to evaluate an expression for each iteration of the cursor may give a slight edge to .fetch().
It is important to note that with .fetch(), all data is now stored in memory, which comes with its own set of considerations. Additionally, at the time of executing .fetch(), the processing done with _.each() is yet to occur, leading to the possibility of "gaining" in one area but potentially "losing" in another.
While general benchmarking may suggest similar timings in most cases, it is crucial to conduct specific benchmarking tailored to the size of the datasets being handled in order to draw accurate conclusions.
In general, the outcome often leans towards being "about the same". However, opting for .fetch() may result in a higher consumption of memory compared to simply iterating through the cursor from the beginning.
Has anyone discovered a way to enable Subresource Integrity with Angular-CLI? I came across this GitHub Pull Request that suggests it may become a feature in the future: GitHub Pull Request. I tried to activate it on the current versions but had no luck. ...
I am attempting to use JavaScript to extract only the link text from a string and remove the href tags. The expected behavior is as shown below: <a href='www.google.com'>google</a>, <a href='www.bing.com'>bing</a> ...
I am currently working on creating a unique custom binding in knockout that is similar to the default options binding handler, but instead of a dropdown, it utilizes radio buttons. Whenever an item is added to the array, the update is triggered. However, ...
I am perplexed by the difference in accessing params in my Next.js API routes compared to traditional express routes. In order to access a specific dynamic route ID, I find myself using req.query instead of the usual params. Is this the preferred method fo ...
I have searched through numerous threads and forums in the hopes of finding a solution, but I haven't been successful. My issue lies with triggering a popup on my website. I followed online tutorials to create a popup window, which I was able to do su ...
One of the functions in my service is a delete function. This function calls an API that returns either true or false. If the response is true, I then proceed to find the index of the item in my array, splice it out, and return the updated array. Here&apos ...
I have been struggling for hours with what seems like a simple problem and haven't made any progress. I'm hoping to receive some valuable advice from the brilliant minds on stackoverflow. You can view my demo at I attempted to use jsfiddle to s ...
Seeking assistance on how to conditionally access a mongoose model in TypeScript code. Does anyone have a solution to resolve this TypeScript error? Each member of the union type has signatures, but none of those signatures are compatible with each other ...
type Props = { checkedItems:any }; class MyApp extends Component<Props> { constructor(props) { super(props); this.checkedItems = []; } } In this code snippet, I am utilizing Flow for type checking within a React class component. However ...
Is anyone familiar with this particular component? <Controller control={control} {...register("DOB", {})} render={({ field }) => ( <LocalizationProvider dateAdapter={AdapterDayjs}> <DatePicker ...
I recently developed a piece of code to ascertain whether a value in the database is null or not. Here's the snippet: var table; var active = false; function CheckActive(table){ this.table = "table" + table + ""; var db = window.openDatabas ...
I am looking to transition my web page request logs from mongo to nginx logs. Is there a parser or tool available that can help me parse the logs and convert them into JSON format, making it easier for querying purposes? This is the current format of mong ...
Hey there, I'm facing an issue with this... getSocketPerSecond = function () { Interval_PerSecond = setInterval(function () { $.ajax({ url: "/asset/ashx/GetSocket.ashx", type: "post", ...
I've designed a unique video slider that cycles through 4 videos. Each video has a custom play button and additional overlay content. Once the video starts playing, the overlay content and play button fade out to reveal the default video controls. The ...
I have a jQuery script and need a function to reset the SELECT input after it has been submitted. <script> $(document).ready(function() { //elements var progressbox = $("#progressbox"); var progressbar = $("#progressbar"); var statustxt = ...
I'm encountering a peculiar issue with my component. It works perfectly fine when retrieving data from State at a high level, but as soon as I try to access nested objects, it throws an error: "TypeError: Cannot read property 'name' of undef ...
element, I am facing an issue while attempting to send a repository object as JSON. In my controller code, I have implemented a conditional check to ensure that the request is made via XmlHttpRequest. Upon receiving the data and fetching the corresponding ...
I am working on a project using Angular UI Router and Coach Potato. I want the UI Router states to load from the server side and then be added to the state provider in the Angular app.config. However, I am encountering an issue where I cannot inject the $h ...
Currently, I have a task that relies on function.caller to verify the authorization of a caller. After reviewing this webpage, it seems that caller is compatible with all major browsers and my unit tests are successful: https://developer.mozilla.org/en-U ...
I'm attempting to make a GET request to the solr search engine using $.ajax() from jQuery. This is the code snippet I'm using for the ajax call: $.ajax({ url : 'http://xxx.xxx.xxx.xxx:port#/solr/mycore/select?indent=on&q=mypa ...