add word scrambling (issue #290)
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[package]
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name = "scramble"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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rand = "0.8.5"
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use rand::seq::SliceRandom;
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/// If you mix up the order of letters in a word, many people can slitl raed and urenadnstd tehm. Write a function that
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/// takes an input sentence, and mixes up the insides of words (anything longer than 3 letters).
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///
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/// Example:
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///
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/// ```
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/// > scramble(["A quick brown fox jumped over the lazy dog."])
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/// > "A qciuk bwron fox jmepud oevr the lzay dog."
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/// ```
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fn main() {
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let mut sentence = "A quick brown fox jumped over the lazy dog.".to_string();
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scramble(&mut sentence);
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println!("{}", sentence);
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}
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fn scramble(sentence: &mut String) {
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let mut i = 0;
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while i < sentence.len() {
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if let Some(word_len) = sentence.get(i..).unwrap().find(' ') {
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if word_len >= 4 {
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let inner = sentence.get_mut(i + 1..i + word_len - 1).unwrap();
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// shuffle it
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let mut rng = rand::thread_rng();
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unsafe {
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inner.as_bytes_mut().shuffle(&mut rng);
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}
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}
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i = i + word_len + 1;
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} else {
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break;
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}
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}
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}
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