DEV Community

Discussion on: Passing Arrays as Function Arguments

toastking profile image
Matt Del Signore

Good ol' this.arguments. My favorite Javascript feature that I'm afraid to use because it doesn't have all the Array methods I want.

samanthaming profile image
Samantha Ming Author

It looks like an array, but unfortunately, it isnt :(

Actually, maybe I should write a post about that. The arguments is an interesting topic and I don't think everyone knows that exists πŸ€” Even if they knew, the post will be a nice reminder πŸ˜‚

Thread Thread
qm3ster profile image
Mihail Malo

@samanthaming if you end up writing a post on it, I beg of you to include warnings about performance and analysis implications, as well as the "single rest argument"((...args)) alternative.
Honestly, that's the only way I see to offset the damage of more people finding out about/remembering it :D

qm3ster profile image
Mihail Malo • Edited

AFAIK it causes deoptimization, while (...args) works much better.
Still, if you expect a real array, like in Math's case, you should just take an array.

Math.max( Array(200000).fill(1))
Math.max.apply(undefined,new Array(200000).fill(1))

These both fail with a stack overflow, and the only way to get an answer is to implement it yourself:

new Array(20000000).fill(1).reduce((a,b)=>b>a?b:a)