<p><a href="https://www.prepswift.com/quizzes/quiz/prepswift-sets-versus-lists" target="_blank">Sets versus Lists Exercise</a></p><p>In previous mountain entries, I kept using the word "dataset" to avoid saying the words "set" or "list." So, without further adieu, I present <strong><span style="color:#8e44ad;">Sets Versus Lists</span></strong>.</p>
<p><strong><span style="color:#e74c3c;">Key Differences</span></strong></p>
<ul>
<li><strong><span style="color:#2980b9;">NOTATION</span></strong>
<ul>
<li>A list is written either without brackets or with square brackets.
<ul>
<li>$1, 2, 3$ or $[1, 2, 3]$</li>
</ul>
</li>
<li>A set is written with cute curly brackets.
<ul>
<li>$ \{1, 2, 3 \}$</li>
</ul>
</li>
</ul>
</li>
<li><strong><span style="color:#2980b9;">ORDER</span></strong>
<ul>
<li>A list's elements are in order. That doesn't necessarily mean "low to high." It means that the first element in the list is ALWAYS at the front of the list. For example, the two lists below are different:
<ul>
<li>$[1, 2, 3] \neq [2, 3, 1]$</li>
</ul>
</li>
<li>A set's elements have no order. For example, the two sets below ARE EQUAL to each other:
<ul>
<li>$ \{ 2, 3, 5, 7 \} = \{ 3, 7, 2, 5 \}$</li>
</ul>
</li>
</ul>
</li>
<li><strong><span style="color:#2980b9;">REPEATED ELEMENTS</span></strong>
<ul>
<li>A list <u>allows repeats</u>. For example, the list $[1, 1, 1]$ has three elements: a $1$ in the first position, a $1$ in the second position, and a $1$ in the third position.</li>
<li>A set does NOT count repeats. For example, the two sets below ARE THE SAME.
<ul>
<li>$\{1, 1, 1, 1, 1\} = \{1\}$</li>
</ul>
</li>
</ul>
</li>
<li><strong><span style="color:#2980b9;">FINITE OR INFINITE?</span></strong>
<ul>
<li>A list is always finite.</li>
<li>A set can be either.
<ul>
<li>Example Finite Set: The set of all positive integers less than $100$.</li>
<li>Example Infinite Set: The set of all positive integers greater than $100$.</li>
</ul>
</li>
</ul>
</li>
</ul>