Some & Every - Functional JavaScript - Supercharged

In this mini series, Surma introduces you to the various functional methods that JavaScript Arrays have to offer. In this episode: some & every!

[jakearchibald]

This is the best episode in the jQuery err supercharged sheries series.

[MaxArt]

One nice thing is that .some breaks out from the loop as soon as a truthy value is returned, while .every does so with a falsy value.
I *might* have abused this to emulate a `break` while iterating over an array...

[pemessh]

Would be helpful if you talked about browser compatibility too !!

[sonicpawnsyou]

I have a relatively general question. I subscribed to you to have my finger on the pulse of time and see you discuss new emerging technologies, drafts, proposals, and to not fall behind. And yet, this series discusses pretty well-known methods that are half a decade old (ES 5.1), which is somewhat disappointing. Don't you think this conflict of interests deserves a secondary channel? Who is the content on your channel for, exactly?

[hrteby]

Oh, so these have been available since IE 9!
I've always used array.find instead of "some", and instead of "every" I've used array.find with an inversed predicate, and inversed the result.
Some/every is a bit cleaner though, there are just so many methods to remember...

[avilde]

Would love to hear something about array.flat )

[VibhavSinha]

I have always used reduce() to implement these. "Some" and "every" is much more readable and they are compatible with all browsers.
some: [].reduce((acc, cv) => acc || test(cv), false)
every: [].reduce((acc, cv) => acc && test(cv), true);

[RafaelCouto]

It's gonna take a while to fix all my huge if statements and turn then into array.every {if(...&&...&&...&&..)} and array.some {if(...||...||...||...)}