48 lines
1.3 KiB
Rust
48 lines
1.3 KiB
Rust
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use rayon::prelude::*;
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use std::collections::HashMap;
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pub fn char_frequencies(lines: &[String]) -> HashMap<char, u64> {
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lines
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.par_iter()
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.fold(
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HashMap::new,
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|mut freqs: HashMap<_, _>, line: &String| {
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for ch in line.chars() {
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*freqs.entry(ch).or_insert(0) += 1;
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}
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freqs
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},
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)
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.reduce(
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HashMap::new,
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|mut freqs1, freqs2| {
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freqs2
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.into_iter()
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.for_each(|(ch, n)| *freqs1.entry(ch).or_insert(0) += n);
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freqs1
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},
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)
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}
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pub fn word_frequencies(lines: &[String]) -> HashMap<String, u64> {
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lines
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.par_iter()
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.fold(
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HashMap::new,
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|mut freqs: HashMap<_, _>, line: &String| {
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for word in line.split_ascii_whitespace() {
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*freqs.entry(word.to_string()).or_insert(0) += 1;
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}
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freqs
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},
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)
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.reduce(
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HashMap::new,
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|mut freqs1, freqs2| {
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freqs2
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.into_iter()
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.for_each(|(word, n)| *freqs1.entry(word).or_insert(0) += n);
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freqs1
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},
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)
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}
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