generating string of set length

Question

I'm trying to generate a string such that if there's a list like [16,24..] and another list ["00","7F"..]

the generated list is [00000000000000000000000000000000,7F7F7F7F7F7F7F7F7F7F7F7F7F7F7F7F, ...

in python the code would be:

 for l in range(16, 32 + 1, 8): for b in ['00', '7f', '80', 'ff']: do_something(b * l);

I'm uncertain how to accomplish this in rust, thus far I've got:

for &i in [16u,24u,32u].iter() { for n in ["00","7f","80","ff"].iter() { } }

but i have no idea how to create the strings.

cafce25 · Accepted Answer · 2023-05-27 11:31:59Z

You can use repeat wich was in it's own trait (std::str::StrAllocating), but nowadays is directly implemented on str directly:

fn main() { for &i in [16u, 24u, 32u].iter() { for n in ["00", "7f", "80", "ff"].iter() { println!("{}", n.repeat(i)) } } }

prints

00000000000000000000000000000000 7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f 80808080808080808080808080808080 ffffffffffffffffffffffffffffffff 000000000000000000000000000000000000000000000000 7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f 808080808080808080808080808080808080808080808080 ffffffffffffffffffffffffffffffffffffffffffffffff 0000000000000000000000000000000000000000000000000000000000000000 7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f 8080808080808080808080808080808080808080808080808080808080808080 ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff

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