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</pre></div><pre class="rust"><code><span class="doccomment">//! Non-production implementations of mathematical and technical concepts in Rust.
/// Various pre-algebra implementations including multiples (planned), factor pairs, etc.
</span><span class="kw">pub mod </span>pre_algebra;
</code></pre></div></section></main></body></html>

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<a href="#2" id="2">2</a>
</pre></div><pre class="rust"><code><span class="doccomment">/// Factors and multiples
</span><span class="kw">pub mod </span>unit1;
</code></pre></div></section></main></body></html>

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</pre></div><pre class="rust"><code><span class="kw">use </span>std::collections::HashSet;
<span class="comment">// TODO: Implement negative integers
</span><span class="doccomment">/// Generates a `HashSet` of factor pairs for a given positive integer `n`.
///
/// This function calculates and returns a `HashSet` containing all unique factor pairs
/// of the input positive integer `n`. A factor pair is a pair of positive integers
/// `(a, b)` where `a` and `b` are both factors of `n` (i.e., `a * b == n`).
///
/// # Arguments
///
/// * `n` - The positive integer for which factor pairs are to be calculated.
///
/// # Returns
///
/// A `HashSet` containing all unique factor pairs of the input integer `n`.
///
/// # Examples
///
/// ```rust
/// use std::collections::HashSet;
/// use ladderz::pre_algebra::unit1::get_factor_pairs;
///
/// fn main() {
/// let result_pairs = get_factor_pairs(12);
/// let expected_pairs: HashSet&lt;(u32, u32)&gt; = [(1, 12), (2, 6), (3, 4)].into();
/// assert_eq!(result_pairs, expected_pairs);
/// }
/// ```
///
/// # Note
///
/// This function calculates factor pairs by iterating through positive integers from 1 to `n`
/// (inclusive) and checking if they divide `n` evenly. If they do, a factor pair `(a, b)` is
/// added to the `HashSet`. The function ensures that factor pairs are unique, so `(a, b)` and
/// `(b, a)` will not both appear in the set.
</span><span class="kw">pub fn </span>get_factor_pairs(n: u32) -&gt; HashSet&lt;(u32, u32)&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>factor_pairs: HashSet&lt;(u32, u32)&gt; = HashSet::new();
<span class="kw">for </span>num <span class="kw">in </span><span class="number">1</span>..n + <span class="number">1 </span>{
<span class="kw">let </span>dividend: u32 = n;
<span class="kw">let </span>divisor: u32 = num;
<span class="kw">let </span>quotient: u32 = dividend / num;
<span class="kw">let </span>remainder: u32 = dividend % num;
<span class="kw">if </span>remainder == <span class="number">0 </span>&amp;&amp; !factor_pairs.contains(<span class="kw-2">&amp;</span>(quotient, divisor)) {
factor_pairs.insert((divisor, quotient));
}
}
factor_pairs
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="attr">#[test]
</span><span class="kw">fn </span>test_get_factor_pairs_1() {
<span class="kw">let </span>result: HashSet&lt;(u32, u32)&gt; = get_factor_pairs(<span class="number">1</span>);
<span class="kw">let </span>expected: HashSet&lt;(u32, u32)&gt; = [(<span class="number">1</span>, <span class="number">1</span>)].into();
<span class="macro">assert_eq!</span>(result, expected);
}
}
</code></pre></div></section></main></body></html>