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Replace for loop with iteration #1404

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Jan 9, 2021
Merged

Replace for loop with iteration #1404

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12 changes: 2 additions & 10 deletions src/std_misc/threads/testcase_mapreduce.md
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Original file line number Diff line number Diff line change
Expand Up @@ -103,21 +103,13 @@ fn main() {
* Collect our intermediate results, and combine them into a final result
************************************************************************/

// collect each thread's intermediate results into a new Vec
let mut intermediate_sums = vec![];
for child in children {
// collect each child thread's return-value
let intermediate_sum = child.join().unwrap();
intermediate_sums.push(intermediate_sum);
}

// combine all intermediate sums into a single final sum.
// combine each thread's intermediate results into a single final sum.
//
// we use the "turbofish" ::<> to provide sum() with a type hint.
//
// TODO: try without the turbofish, by instead explicitly
// specifying the type of final_result
let final_result = intermediate_sums.iter().sum::<u32>();
let final_result = children.into_iter().map(|c| c.join().unwrap()).sum::<u32>();

println!("Final sum result: {}", final_result);
}
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