Hacker News Reader

Hacker News

Comment by halfmatthalfcat | Hacker News Reader

Parent Full thread

halfmatthalfcat

Can save more bits by doing:

Array.from({ length: 10000 }, button.click);

View on HN

I this awesome... I've always done Array.from(new Array

But your approach makes perfect sense and is so much cleaner. Thank you!

If anyone is wondering why it works, it's because everything in JavaScript is an object. So, an array is an object with a length prop. Apparently Array.from just needs any object with a length prop to work

Something about ducks?

"If it walks like a duck, and it quacks like a duck, then it must be an object"

Of it has feathers, then as far as I'm concerned it is a duck.

Similarly, when I pick up a feathered pen in real life I become a duck

"If it walks like a duck, and it quacks like a duck, then it must be created by a QuackEnumeratorWalkManangerRepositoryProxyFactoryFactoryAdapterBroker." -Java

duckduckduck.duck is still available, by the way.

Well, .duck isn't a TLD yet and it may not be publicly available...

https://icannwiki.org/.duck

Now gogo.duck and go.duck would be nice aliases for DuckDuckGo. (There is ddg.gg of course.)

I did not know this variant, thanks. Having to fill the array with anything (even `undefined`) to iterate on it seemed such a weird concept (but then again, JS is weird).

new Array(1000); ?

Try iterating on it, it won't work. This creates 1000 "empty slots".

In addition to franky47's more important point, I'll add that `new Array()` and `Array()` are equivalent.

In java it would be default initialized but it isn't in js

The spread operator does not have the same quirk. I use it but it's still a bit weird tough

[...new Array(1000)].map(something)

You can drop the new

[...Array(1000)]

I think that is the least bits. Would love to be proven wrong :D

It may be shorter, but I like the spread syntax best used sparingly, it's harder to grasp why it was necessary there at a glance.

That's what I like in the elegance of Array.from({ length: 1000 }): it's a hack, but it reads naturally.

"Harder to grasp" only lasts until you're mildly familiar with the idiom.

[...Array(1e3)]

Never heard of a "from" loop before.

Array.from lets you build an array from an iterable source (often used in conjunction with `new Set` to eliminate duplicates), or in this case, of a fixed length.

Not JavaScript, but... https://en.m.wikipedia.org/wiki/COMEFROM

Reply on news.ycombinator.com