Programming Horror

2064 readers

1 users here now

Welcome to Programming Horror!

This is a place to share strange or terrible code you come across.

For more general memes about programming there's also Programmer Humor.

Looking for mods. If youre interested in moderating the community feel free to dm @[email protected]

Rules

Keep content in english
No advertisements (this includes both code in advertisements and advertisement in posts)
No generated code (a person has to have made it)

Credits

Icon base made by Lorc under CC BY 3.0 with modifications to add a gradient

founded 2 years ago

MODERATORS

[email protected]

When your language doesn't allow arbitrary expressions in format strings (programming.dev)

submitted 2 years ago by [email protected] to c/[email protected]

3 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 0 points 2 years ago (2 children)

You can give it variables:

let foo = 4;
let bar = "bar";
format!("{foo}{bar}");

If you have a format string that long with arbatary expressions putting them all raw in the format string is not going to improve much. Better to give them actual names first.

[–] [email protected] 0 points 2 years ago (1 children)

in this case it's about 80% function calls. They're convenience functions for assembly instructions, so they're of the form:

load(Reg::D, "A"),
load_const(5),

which is more useful than variables would be. I guess i could use .join or a crate like concat_string? Either way i sorely miss arbitrary expression format strings from python =(

[–] [email protected] 1 points 2 years ago

As far as I remember, the point for not allowing arbitrary expressions is that it makes what looks like formatting an arbitrary complex operation and that it doesn't improve readability that much.

Although sometimes I miss being able to refer to fields in format, for function calls and especially this many, I agree with an advice to put strings in a vector and joining them. Plus, there is a limit to how many arguments format macro can accept, iirc