Just curious if anyone finds these types of basic level tutorials useful? I mean, generics are probably a core feature in using TypeScript in the first place. There's also a lot of posts that are pretty intro js or node as well. Curious what opinions are.
I'd suggest posting on stack overflow.
That said..
const checks = Array.from(
document.querySelectorAll('input[name^=newpackqty]')
);
const noSrcLabels = !checks.find(el => ~~el.value);
the first one gets all inputs with a name that starts with newpackqty, and the second checks to find if one has a numeric value that is not 0, and inverts the rsult (!).
The blacklist isn't really much worse than the whitelist depending on the database... though if you're using a distributed/redundant db, such as Cassandra/Scylla, BigTable, Dynamo or Storage Tables, then a whitelist can be opportunistic.
If you're using a structured (SQL) database, either white or blacklist should work roughly equally.
While this does show how you *could* use linked lists in JavaScript, in practice, don't do this... just use JS Arrays with plain objects. The overhead for the article's methods will generally take a lot more memory and not really perform better than Array.prototype methods already available.
Decent primer on iterables. As I was reading, was getting ready to make a comment about generators and async generators, but it's noted in the last paragraph. Look forwar to the next/related article.
Arrays and Objects in JS are not quite 1:1 as the memory structures for lower-level languages. Arrays are more like enhanced objects, with more indexes. Objects are also a bit more than just a hash table, it's just he easiest way to think about it.
I'd suggest posting on stack overflow. That said.. const checks = Array.from( document.querySelectorAll('input[name^=newpackqty]') ); const noSrcLabels = !checks.find(el => ~~el.value); the first one gets all inputs with a name that starts with newpackqty, and the second checks to find if one has a numeric value that is not 0, and inverts the rsult (!).