Intermediate Exercism • rust

Accumulate

Challenge Overview

Implement the `accumulate` operation, which, given a collection and an operation to perform on each element of the collection, returns a new collection containing the result of applying that operation to each element of the input collection.

Instructions

Implement the accumulate operation, which, given a collection and an operation to perform on each element of the collection, returns a new collection containing the result of applying that operation to each element of the input collection.

Given the collection of numbers:

1, 2, 3, 4, 5

And the operation:

square a number (x => x * x)

Your code should be able to produce the collection of squares:

1, 4, 9, 16, 25

Check out the test suite to see the expected function signature.

Restrictions

Keep your hands off that collect/map/fmap/whatchamacallit functionality provided by your standard library! Solve this one yourself using other basic tools instead.

Community Solutions

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The following are the top 3 community solutions by stars:

Solution 1 by @pedantic (⭐ 1) — View on Exercism
Solution 2 by @JDygert (⭐ 1) — View on Exercism
Solution 3 by @jakm (⭐ 0) — View on Exercism

Source: Exercism rust/accumulate

💡 View Solution

pub fn map<T, U, F>(input: Vec<T>, mut function: F) -> Vec<U>
where
    F: FnMut(T) -> U,
{
    let mut v = Vec::with_capacity(input.len());
    for i in input {
        v.push(function(i));
    }

    v