How to apply step when iterating over string characters?

Question

Is there an easy way to apply a step during iteration? I have seen a reference to step_by() in the book but I cant seem to get it to work.

For example, to print every-other character of a string I can do this but is there an easier way?

let s1 = "whhaatt".to_string();

for letter in s1.chars().enumerate() {
    let (i, l) = letter;
    if i % 2 == 0 {
        println!("{:?}", l );
    }
}

Note: chars return code-points, not necessarily what is graphically represented as a single character, hope that's alright with you, — Matthieu M.
– Matthieu M., Commented Jun 25, 2015 at 13:53
Note: I found the referenced step_by and it is only implemented for Range and RangeFrom. — Matthieu M.
– Matthieu M., Commented Jun 25, 2015 at 13:56

DK. · Accepted Answer · 2015-06-25 13:54:35Z

3

The simplest way would be to use the step adaptor from the itertools crate. In this case, you could use s1.chars().step(2).

Aside: Your code does not iterate over "characters"; it iterates over code points. It's quite likely that you want the graphemes method from the unicode-segmentation crate.

answered Jun 25, 2015 at 13:54

DK.

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2 Comments

kezzos Over a year ago

Thanks, was the syntax for step_by() changed to setp()?

bluss Over a year ago

.step_by is only for ranges. .step() is for all iterators (it might be slow because of this)

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