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<!-- 2023-05-07 Sun 10:55 -->
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<meta name="author" content="Sławomir Grochowski" />
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<body>
<div id="content" class="content">
<p>
<a href="https://github.com/slk500/clojure-collections-comparison">https://github.com/slk500/clojure-collections-comparison</a> is open for MR.
</p>
<p>
legend:
</p>
<ul class="org-ul">
<li>'1' means minimal data provided e.g (list 1), (vector 1), (hash-map :a 1)</li>
<li>'coll' is one of data type: list, vector, hash-set, sorted-set, hash-map. Because everyone of them is a collection.</li>
</ul>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<colgroup>
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
</colgroup>
<thead>
<tr>
<th scope="col" class="org-left">item</th>
<th scope="col" class="org-left">list</th>
<th scope="col" class="org-left">vector</th>
<th scope="col" class="org-left">hash-set</th>
<th scope="col" class="org-left">sorted-set</th>
<th scope="col" class="org-left">hash-map</th>
<th scope="col" class="org-left">sorted-map</th>
</tr>
</thead>
<tbody>
<tr>
<td class="org-left">"literal syntax"</td>
<td class="org-left">()</td>
<td class="org-left">[ ]</td>
<td class="org-left">#{}</td>
<td class="org-left">#{}</td>
<td class="org-left">{}</td>
<td class="org-left">{}</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">create from args</td>
<td class="org-left">(list 1 2 3)</td>
<td class="org-left">(vector 1 2 3)</td>
<td class="org-left">(hash-set 2 3 1)</td>
<td class="org-left">(sorted-set 1 2 3)</td>
<td class="org-left">(hash-map :b 2 :c 3 :a 1)</td>
<td class="org-left">(sorted-map :a 1 :b 2 :c 3)</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">create from collection</td>
<td class="org-left">(apply list [1 2 3])</td>
<td class="org-left">(vec '(1 2 3))</td>
<td class="org-left">(set '(2 3 1))</td>
<td class="org-left">(apply sorted-set [2 3 1])</td>
<td class="org-left">(into (hash-map) {:a 1 :b 2 :c 3})</td>
<td class="org-left">(into (sorted-map) {:a 1 :b 2 :c 3})</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(coll? coll)</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(sequential? coll)</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(associative? coll)</td>
<td class="org-left">false</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(type coll)</td>
<td class="org-left">PersistentList$EmptyList</td>
<td class="org-left">PersistentVector</td>
<td class="org-left">PersistentHashSet</td>
<td class="org-left">PersistentTreeSet</td>
<td class="org-left">PersistentArrayMap</td>
<td class="org-left">PersistentTreeMap</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(type (coll 1))</td>
<td class="org-left">PersistentList</td>
<td class="org-left">PersistentVector</td>
<td class="org-left">PersistentHashSet</td>
<td class="org-left">PersistentTreeSet</td>
<td class="org-left">PersistentArrayMap</td>
<td class="org-left">PersistentTreeMap</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(list? coll)</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(vector? coll)</td>
<td class="org-left">false</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(set? coll)</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(map? coll)</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(seq? coll)</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(seq? (coll 1))</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(seq? (seq coll))</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(seq? (seq (coll 1))</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(type (seq coll))</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(type (sequence coll)</td>
<td class="org-left">PersistentList$EmptyList</td>
<td class="org-left">PersistentList$EmptyList</td>
<td class="org-left">PersistentList$EmptyList</td>
<td class="org-left">PersistentList$EmptyList</td>
<td class="org-left">PersistentList$EmptyList</td>
<td class="org-left">PersistentList$EmptyList</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(type (sequence (coll 1)))</td>
<td class="org-left">PersistentList</td>
<td class="org-left">PersistentVector$ChunkedSeq</td>
<td class="org-left">APersistentMap$KeySeq</td>
<td class="org-left">APersistentMap$KeySeq</td>
<td class="org-left">PersistentHashMap$NodeSeq</td>
<td class="org-left">PersistentTreeMap$Seq</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(type (seq (coll 1)))</td>
<td class="org-left">PersistentList</td>
<td class="org-left">PersistentVector$ChunkedSeq</td>
<td class="org-left">APersistentMap$KeySeq</td>
<td class="org-left">APersistentMap$KeySeq</td>
<td class="org-left">PersistentHashMap$NodeSeq</td>
<td class="org-left">PersistentTreeMap$Seq</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"unique elements"</td>
<td class="org-left">false</td>
<td class="org-left">false</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true (only keys)</td>
<td class="org-left">true (only keys)</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"same order of elements"</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">true</td>
<td class="org-left">false</td>
<td class="org-left">true</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"read"</td>
<td class="org-left">nth</td>
<td class="org-left">get, IFn, nth</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left">get, IFn, key</td>
<td class="org-left">get, IFn, key</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(get coll 1)</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(get (coll 1) 1)</td>
<td class="org-left">nil</td>
<td class="org-left">true (index)</td>
<td class="org-left">useless</td>
<td class="org-left">useless</td>
<td class="org-left">true (key)</td>
<td class="org-left">true (key)</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(get nil 1)</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"get out of range"</td>
<td class="org-left">nil or not-found</td>
<td class="org-left">nil or not-found</td>
<td class="org-left">nil or not-found</td>
<td class="org-left">nil or not-found</td>
<td class="org-left">nil or not-found</td>
<td class="org-left">nil or not-found</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"IFn"</td>
<td class="org-left">error</td>
<td class="org-left">([:a :b :c] 1) => :b</td>
<td class="org-left">error</td>
<td class="org-left">error</td>
<td class="org-left">({:b 2 :c 3 :a 1} :b) => 2</td>
<td class="org-left">({:a 1 :b 2 :c 3} :a) => 1</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"IFn out of range"</td>
<td class="org-left">error</td>
<td class="org-left">error</td>
<td class="org-left">error</td>
<td class="org-left">error</td>
<td class="org-left">nil</td>
<td class="org-left">nil</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"nth"</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">true</td>
<td class="org-left">error</td>
<td class="org-left">error</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">(nth nil 1)</td>
<td class="org-left"> </td>
<td class="org-left">nil</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"nth out of range"</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"add"</td>
<td class="org-left">cons, conj</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left">assoc</td>
<td class="org-left">assoc</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"conj (coll)"</td>
<td class="org-left">front</td>
<td class="org-left">back</td>
<td class="org-left">vary</td>
<td class="org-left">vary</td>
<td class="org-left">vary</td>
<td class="org-left">vary</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"cons (seq)"</td>
<td class="org-left">front</td>
<td class="org-left">front</td>
<td class="org-left">vary</td>
<td class="org-left">vary</td>
<td class="org-left">vary</td>
<td class="org-left">vary</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"remove"</td>
<td class="org-left"> </td>
<td class="org-left">disj</td>
<td class="org-left"> </td>
<td class="org-left"> </td>
<td class="org-left">dissoc</td>
<td class="org-left"> </td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-left">"contains?"</td>
<td class="org-left">error</td>
<td class="org-left">true (index)</td>
<td class="org-left">true (element)</td>
<td class="org-left">true (element)</td>
<td class="org-left">true (key)</td>
<td class="org-left">true (key)</td>
</tr>
</tbody>
</table>
<div id="outline-container-org9629c30" class="outline-2">
<h2 id="org9629c30"><span class="section-number-2">1.</span> "literal syntax"</h2>
<div class="outline-text-2" id="text-1">
<div class="org-src-container">
<pre class="src src-clojure">(type '()) <span style="color: #696969;">;=> PersistentList$EmptyList</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org23d3274" class="outline-2">
<h2 id="org23d3274"><span class="section-number-2">2.</span> create from args</h2>
<div class="outline-text-2" id="text-2">
</div>
</div>
<div id="outline-container-orge4a3d8b" class="outline-2">
<h2 id="orge4a3d8b"><span class="section-number-2">3.</span> create from collection</h2>
<div class="outline-text-2" id="text-3">
<div class="org-src-container">
<pre class="src src-clojure">(apply list [1 2 3]) <span style="color: #696969;">;=> (1 2 3)</span>
(apply sorted-set [2 3 1]) <span style="color: #696969;">;=> #{1 2 3}</span>
(into (hash-map) {<span style="color: #d2a6ff;">:a</span> 1 <span style="color: #d2a6ff;">:b</span> 2}) <span style="color: #696969;">;=> {:a 1, :b 2}</span>
(into (sorted-map) {<span style="color: #d2a6ff;">:b</span> 2 <span style="color: #d2a6ff;">:c</span> 3 <span style="color: #d2a6ff;">:a</span> 1}) <span style="color: #696969;">;=> {:a 1, :b 2, :c 3}</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org0216559" class="outline-2">
<h2 id="org0216559"><span class="section-number-2">4.</span> (coll? coll)</h2>
<div class="outline-text-2" id="text-4">
<div class="org-src-container">
<pre class="src src-clojure">(coll? (list)) <span style="color: #696969;">; => true</span>
(coll? (vector)) <span style="color: #696969;">; => true</span>
(coll? (hash-set)) <span style="color: #696969;">; => true</span>
(coll? (sorted-set)) <span style="color: #696969;">; => true</span>
(coll? (hash-map)) <span style="color: #696969;">; => true</span>
(coll? (sorted-map)) <span style="color: #696969;">; => true</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org62d362b" class="outline-2">
<h2 id="org62d362b"><span class="section-number-2">5.</span> (sequential? coll)</h2>
<div class="outline-text-2" id="text-5">
<p>
Returns true if coll implements Sequential
</p>
<p>
Definitions from Oxford Languages: sequential - forming or following in a logical order or sequence.
</p>
<div class="org-src-container">
<pre class="src src-clojure">(sequential? (list)) <span style="color: #696969;">;=> true</span>
(sequential? (vector)) <span style="color: #696969;">;=> true</span>
(sequential? (hash-set)) <span style="color: #696969;">;=> false</span>
(sequential? (sorted-set)) <span style="color: #696969;">;=> false</span>
(sequential? (hash-map)) <span style="color: #696969;">;=> false</span>
(sequential? (sorted-map)) <span style="color: #696969;">;=> false</span>
</pre>
</div>
<p>
I was thinking that sorted-set & sorted-map are (= sequential? true)
They have logical order (they are sorted) so why they are not sequential?
</p>
<p>
dgb23
hashed collections have sequence representations (map entries) that are sequential.
I think it is more of an implementation thing. In theory you're right, they are both sequential and hashed collections.
</p>
<p>
phill
The sequential? docstring tells me nothing about what it does! I do not see a basis for expectation of any particular return value. It would be a good question for ask.clojure.org so it might get clarified.
However, it would be normal for sequential? to mean "preserves the order of insertion?" which vectors do (expect true), lists do in reverse (expect -true), and sets and maps never do (expect false). (edited)
</p>
<p>
dgb23
Sequential is an empty interface. I think it's just a signal that is put on certain implementations.
</p>
</div>
</div>
<div id="outline-container-org94a0e92" class="outline-2">
<h2 id="org94a0e92"><span class="section-number-2">6.</span> (associative? coll)</h2>
<div class="outline-text-2" id="text-6">
<p>
Returns true if coll implements Associative
</p>
<div class="org-src-container">
<pre class="src src-clojure">(associative? (list)) <span style="color: #696969;">;=> false</span>
(associative? (vector)) <span style="color: #696969;">;=> true</span>
(associative? (hash-set)) <span style="color: #696969;">;=> false</span>
(associative? (sorted-set)) <span style="color: #696969;">;=> false</span>
(associative? (hash-map)) <span style="color: #696969;">;=> true</span>
(associative? (sorted-map)) <span style="color: #696969;">;=> true</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org8728407" class="outline-2">
<h2 id="org8728407"><span class="section-number-2">7.</span> (type coll)</h2>
<div class="outline-text-2" id="text-7">
<p>
Returns the :type metadata of x, or its Class if none
</p>
<div class="org-src-container">
<pre class="src src-clojure">(type (list)) <span style="color: #696969;">;=> Persistentlist$EmptyList</span>
(type (vector)) <span style="color: #696969;">;=> PersistentVector</span>
(type (hash-set)) <span style="color: #696969;">;=> PersistentHashSet</span>
(type (sorted-set)) <span style="color: #696969;">;=> PersistentTreeSet</span>
(type (hash-map)) <span style="color: #696969;">;=> PersistentArrayMap</span>
(type (sorted-map)) <span style="color: #696969;">;=> PersistentTreeMap</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org1f6bca8" class="outline-2">
<h2 id="org1f6bca8"><span class="section-number-2">8.</span> (type (coll 1))</h2>
<div class="outline-text-2" id="text-8">
<div class="org-src-container">
<pre class="src src-clojure">(type (list 1)) <span style="color: #696969;">;=> Persistentlist</span>
(type (vector 1)) <span style="color: #696969;">;=> PersistentVector</span>
(type (hash-set 1)) <span style="color: #696969;">;=> PersistentHashSet</span>
(type (sorted-set 1)) <span style="color: #696969;">;=> PersistentTreeSet</span>
(type (hash-map <span style="color: #d2a6ff;">:a</span> 1)) <span style="color: #696969;">;=> PersistentHashMap</span>
(type (sorted-map <span style="color: #d2a6ff;">:a</span> 1)) <span style="color: #696969;">;=> PersistentTreeMap</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org76c581a" class="outline-2">
<h2 id="org76c581a"><span class="section-number-2">9.</span> (list? coll)</h2>
<div class="outline-text-2" id="text-9">
<p>
Returns true if x implements IPersistentlist
</p>
<div class="org-src-container">
<pre class="src src-clojure">(list? (list)) <span style="color: #696969;">;=> true</span>
(list? (vector)) <span style="color: #696969;">;=> false</span>
(list? (hash-set)) <span style="color: #696969;">;=> false</span>
(list? (sorted-set)) <span style="color: #696969;">;=> false</span>
(list? (hash-map)) <span style="color: #696969;">;=> false</span>
(list? (sorted-map)) <span style="color: #696969;">;=> false</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org37a5ef5" class="outline-2">
<h2 id="org37a5ef5"><span class="section-number-2">10.</span> (vector? coll)</h2>
<div class="outline-text-2" id="text-10">
<p>
Return true if x implements IPersistentVector
</p>
<div class="org-src-container">
<pre class="src src-clojure">(vector? (list)) <span style="color: #696969;">;=> false</span>
(vector? (vector)) <span style="color: #696969;">;=> true</span>
(vector? (hash-set)) <span style="color: #696969;">;=> false</span>
(vector? (sorted-set)) <span style="color: #696969;">;=> false</span>
(vector? (hash-map)) <span style="color: #696969;">;=> false</span>
(vector? (sorted-map)) <span style="color: #696969;">;=> false</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org50be9d2" class="outline-2">
<h2 id="org50be9d2"><span class="section-number-2">11.</span> (set? coll)</h2>
<div class="outline-text-2" id="text-11">
<div class="org-src-container">
<pre class="src src-clojure">(set? (list)) <span style="color: #696969;">;=> false</span>
(set? (vector)) <span style="color: #696969;">;=> false</span>
(set? (hash-set)) <span style="color: #696969;">;=> true</span>
(set? (sorted-set)) <span style="color: #696969;">;=> true</span>
(set? (hash-map)) <span style="color: #696969;">;=> false</span>
(set? (sorted-map)) <span style="color: #696969;">;=> false</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org40aadea" class="outline-2">
<h2 id="org40aadea"><span class="section-number-2">12.</span> (map? coll)</h2>
<div class="outline-text-2" id="text-12">
<div class="org-src-container">
<pre class="src src-clojure">(map? (list)) <span style="color: #696969;">;=> false</span>
(map? (vector)) <span style="color: #696969;">;=> false</span>
(map? (hash-set)) <span style="color: #696969;">;=> false</span>
(map? (sorted-set)) <span style="color: #696969;">;=> false</span>
(map? (hash-map)) <span style="color: #696969;">;=> true</span>
(map? (sorted-map)) <span style="color: #696969;">;=> true</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-orga0ee739" class="outline-2">
<h2 id="orga0ee739"><span class="section-number-2">13.</span> (seq? coll)</h2>
<div class="outline-text-2" id="text-13">
<p>
Return true if x implements ISeq
</p>
<div class="org-src-container">
<pre class="src src-clojure">(seq? (list)) <span style="color: #696969;">;=> true</span>
(seq? (vector)) <span style="color: #696969;">;=> false</span>
(seq? (hash-set)) <span style="color: #696969;">;=> false</span>
(seq? (sorted-set)) <span style="color: #696969;">;=> false</span>
(seq? (hash-map)) <span style="color: #696969;">;=> false</span>
(seq? (sorted-map)) <span style="color: #696969;">;=> false</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org05be053" class="outline-2">
<h2 id="org05be053"><span class="section-number-2">14.</span> (seq? (coll 1))</h2>
<div class="outline-text-2" id="text-14">
<p>
Return true if x implements ISeq
</p>
<div class="org-src-container">
<pre class="src src-clojure">(seq? (list 1)) <span style="color: #696969;">;=> true</span>
(seq? (vector 1)) <span style="color: #696969;">;=> false</span>
(seq? (hash-set 1)) <span style="color: #696969;">;=> false</span>
(seq? (sorted-set 1)) <span style="color: #696969;">;=> false</span>
(seq? (hash-map <span style="color: #d2a6ff;">:a</span> 1)) <span style="color: #696969;">;=> false</span>
(seq? (sorted-map <span style="color: #d2a6ff;">:a</span> 1)) <span style="color: #696969;">;=> false</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org8a5f016" class="outline-2">
<h2 id="org8a5f016"><span class="section-number-2">15.</span> (seq? (seq coll))</h2>
<div class="outline-text-2" id="text-15">
<div class="org-src-container">
<pre class="src src-clojure">(seq? (seq (list))) <span style="color: #696969;">;=> false</span>
(seq? (seq (vector))) <span style="color: #696969;">;=> false</span>
(seq? (seq (hash-set))) <span style="color: #696969;">;=> false</span>
(seq? (seq (sorted-set))) <span style="color: #696969;">;=> false</span>
(seq? (seq (hash-map))) <span style="color: #696969;">;=> false</span>
(seq? (seq (sorted-map))) <span style="color: #696969;">;=> false</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org60d5754" class="outline-2">
<h2 id="org60d5754"><span class="section-number-2">16.</span> (seq? (seq (coll 1))</h2>
<div class="outline-text-2" id="text-16">
<div class="org-src-container">
<pre class="src src-clojure">(seq? (seq (list 1))) <span style="color: #696969;">;=> true</span>
(seq? (seq (vector 1))) <span style="color: #696969;">;=> true</span>
(seq? (seq (hash-set 1))) <span style="color: #696969;">;=> true</span>
(seq? (seq (sorted-set 1))) <span style="color: #696969;">;=> true</span>
(seq? (seq (hash-map <span style="color: #d2a6ff;">:a</span> 1))) <span style="color: #696969;">;=> true</span>
(seq? (seq (sorted-map <span style="color: #d2a6ff;">:a</span> 1))) <span style="color: #696969;">;=> true</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org5a33671" class="outline-2">
<h2 id="org5a33671"><span class="section-number-2">17.</span> (type (seq coll))</h2>
<div class="outline-text-2" id="text-17">
<p>
clojure.core/seq
([coll])
</p>
<p>
Returns a seq on the collection. If the collection is
empty, returns nil. (seq nil) returns nil. seq also works on
Strings, native Java arrays (of reference types) and any objects
that implement Iterable. Note that seqs cache values, thus seq
should not be used on any Iterable whose iterator repeatedly
returns the same mutable object.
</p>
<div class="org-src-container">
<pre class="src src-clojure">(type (seq (list))) <span style="color: #696969;">;=> nil</span>
(type (seq (vector))) <span style="color: #696969;">;=> nil</span>
(type (seq (hash-set))) <span style="color: #696969;">;=> nil</span>
(type (seq (sorted-set))) <span style="color: #696969;">;=> nil</span>
(type (seq (hash-map))) <span style="color: #696969;">;=> nil</span>
(type (seq (sorted-map))) <span style="color: #696969;">;=> nil</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org3e6918d" class="outline-2">
<h2 id="org3e6918d"><span class="section-number-2">18.</span> (type (sequence coll)</h2>
<div class="outline-text-2" id="text-18">
<p>
clojure.core/sequence
([coll] [xform coll] [xform coll & colls])
Coerces coll to a (possibly empty) sequence, if it is not already
one. Will not force a lazy seq. (sequence nil) yields (), When a
transducer is supplied, returns a lazy sequence of applications of
the transform to the items in coll(s), i.e. to the set of first
items of each coll, followed by the set of second
items in each coll, until any one of the colls is exhausted. Any
remaining items in other colls are ignored. The transform should accept
number-of-colls arguments
</p>
<div class="org-src-container">
<pre class="src src-clojure">(type (sequence (list))) <span style="color: #696969;">;=> PersistentList$Emptylist</span>
(type (sequence (vector))) <span style="color: #696969;">;=> PersistentList$Emptylist</span>
(type (sequence (hash-set))) <span style="color: #696969;">;=> PersistentList$Emptylist</span>
(type (sequence (sorted-set))) <span style="color: #696969;">;=> PersistentList$Emptylist</span>
(type (sequence (hash-map))) <span style="color: #696969;">;=> PersistentList$Emptylist</span>
(type (sequence (sorted-map))) <span style="color: #696969;">;=> PersistentList$Emptylist</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org5a55dea" class="outline-2">
<h2 id="org5a55dea"><span class="section-number-2">19.</span> (type (sequence (coll 1)))</h2>
<div class="outline-text-2" id="text-19">
<p>
clojure.core/sequence
([coll] [xform coll] [xform coll & colls])
Coerces coll to a (possibly empty) sequence, if it is not already
one. Will not force a lazy seq. (sequence nil) yields (), When a
transducer is supplied, returns a lazy sequence of applications of
the transform to the items in coll(s), i.e. to the set of first
items of each coll, followed by the set of second
items in each coll, until any one of the colls is exhausted. Any
remaining items in other colls are ignored. The transform should accept
number-of-colls arguments
</p>
<div class="org-src-container">
<pre class="src src-clojure">(type (sequence (list 1))) <span style="color: #696969;">;=> PersistentList</span>
(type (sequence (vector 1))) <span style="color: #696969;">;=> PersistentVector$ChunkedSequence</span>
(type (sequence (hash-set 1))) <span style="color: #696969;">;=> APersistentMap$KeySequence</span>
(type (sequence (sorted-set 1))) <span style="color: #696969;">;=> APersistentMap$KeySequence</span>
(type (sequence (hash-map <span style="color: #d2a6ff;">:a</span> 1))) <span style="color: #696969;">;=> PersistentHashMap$NodeSequence</span>
(type (sequence (sorted-map <span style="color: #d2a6ff;">:a</span> 1))) <span style="color: #696969;">;=> PersistentTreeMap$Sequence</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-orga68a9d5" class="outline-2">
<h2 id="orga68a9d5"><span class="section-number-2">20.</span> (type (seq (coll 1)))</h2>
<div class="outline-text-2" id="text-20">
<p>
clojure.core/seq
([coll])
</p>