Luka Vidaković articles - 23 total
JS Date constructor timezone oddity
new Date('YYYY-MM-DD') might not do what you think it does For a long time, I only did...
Measure time with a higher order utility function
I consider closures and higher order functions to be one of the most powerful language features, if n...
takeLatest Promise util function
On frontend, you may have a piece of code that fires network requests very quickly, based on user int...
Cancelable Promise util
I found myself using this code and some derivatives time and time again so I decided to share. It's n...
Handling custom error types in Express.js
In 2 previous posts we explained how to create a custom error type and created a few custom HTTP erro...
From custom error types to a custom error subtype
Previously we defined our most basic custom error class that extends the Javascript's Error prototype...
Custom error types in Node.js
Custom error types in node can provide a clearer picture of a failure. Relying on generic errors ofte...
Communicating with an iframe — postMessage bare bones example
I keep forgetting how communication between a main window and an iframe works because I don't use it...
Exponential backoff logic for a code scheduler
We have our scheduler factory from a previous post: function createScheduler({ callback, time, call...
Timeout mechanism using Promise.race
So we have a scheduler factory function. Simple mechanism that runs code periodically. Here is the co...
Implementing scheduler's stop mechanism
In previous post, we untangled our pause and loop mechanisms but the main flaw of not being able to s...
Improving our periodic code scheduler
Previously, we constructed a pretty simple and naive system that periodically runs a function. Not gr...
Run code periodically using Promises
Previous post describes an implementation of a one-liner pause mechanism using a Promise. Here it is...
One-line pause function in plain Javascript
This is first post in series, explaining how to build a plain javascript code scheduler. Schedulers a...
Async without await
Some developers get annoyed by async functions that don't use await functionality. There are even lin...
Shortwire the async/await's catch
Handling exceptions in the async/await functions can become really bothersome. You can have multiple...
Public, cross-domain accessible APIs?
Do you know of any useful public APIs with CORS headers set to allow access from other domains? I'm c...
CORS mechanism in short
tl;dr To allow cross-domain requests: server needs to respond with correct HTTP headers...
Javascript ghosts
This posts follows the one about call stack obfuscation. It’s just a proof of concept to further cove...
Escaping the call stack
Let’s look at one way to cover the tracks within injected javascript code. It exploits asynchronous j...
Promise.resolve() everything
Ever had a block of code that, based on a condition can fetch data asynchronosuly or synchronously? I...
Canvas and data integrity
If you ever decide to do bitwise operations and do “bit-precise” data storing inside canvas image dat...
Relative color luminance
C/P-ing this from my older blog posts. This one is from 2014. since I was a junior dev pretty much. N...