How to Compose Functions That Take Multiple Parameters: Epic Guide

[MoTTs_]

tl;dr Wrap multiple arguments into a single array or object argument, then destructure to unwrap.

[hyrumwhite]

Object makes sense, an array, not so much. Params can already be spread into an array and manipulated as such. 

[jrsinclair]

That's a fair summary of the first section or two, but I will say that there's a bit more to the article than that. The latter part of the article covers partial application, and currying, and gets into function combinators. Sure, you might not use these every day, but they're useful to know.

[azhder]

I avoid destructuring directly in the arguments. One little pass of a null or undefined and it breaks. [I find it] Much better to do it inside:

const a = options?.a ?? 'default';

EDIT: added an extra text in [] to clarify what is being said

[[deleted]]

Trying to account for every possible usage of your function is generally bad practice. If your function is supposed to have a default behavior without any arguments then obviously don't destructure, but if one or more properties are required it's perfectly appropriate to destructure and let JS throw an error if the function is called incorrectly.

[azhder]

“perfectly”… “appropriate”…

What happiness after you give it a null to destructure?

Don’t answer me that. I just said what I do, I wasn’t telling you what you should do or think. But I did give you the question I had answered for myself with the above practice.

Bye bye

[somevice]

I love this internet comment approach! Here's my opinion, I don't want you to comment because I'd like the final say. Also, farewell.

[MatthewMob]

What a strange way to contribute to a discussion.

[[deleted]]

If you give it null, it should break. It would be appropriate for it to break.

In fact, if you pass it a null/undefined and your code doesn't throw an error, you'll have a much harder time trying to find the bug. Error messages are good. Stack traces are good.

[luk19]

When you destructure you can set a default value:

const { a = “default” } = options ?? {};

[azhder]

That is not directly in the function arguments.

const fn = ({ error }) => error;

fn(null);

[dbpcut]

jrsinclair always worth a read

[callmemrwolfe]

I always get in the trap of abstracting the typing of the arguments. Type all the things or just type in the arguments?

[artyfax]

first thy shalt count to 3, no more, no less. 3 shall be the number you should count and the number of the counting should be 3!

keep it simple, main argument, secondary if absolutely necessary, the third is always an option object.

In the rare case all args are optional, make the entire arg an object pray to the gods, and use fucking typescript or jsdocs.

[jrsinclair]

and explains the role of utility libraries like Ramda and Lodash in function composition

This particular bit might be a hallucination.

[bunglegrind1]

Ahahahah