One possible con: this is subtly but extremely different from Python, where a for loop&#39;s else clause is executed only if there was no `break` from the loop.<br><div class="gmail_quote"><div dir="ltr">On Wed, Feb 1, 2017 at 8:48 AM Chris Davis via swift-evolution &lt;<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>&gt; wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class="gmail_msg">Hi,<div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Often when I’m programming I stumble upon this scenario:</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">I have a list of items that may or may not be empty - if it’s full, I do one thing, if it’s empty I do something else, my code looks like this:</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg"><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">class</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> Example_1</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">{</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(209,47,27)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">    </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">let</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"> names = [</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">&quot;Chris&quot;</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">, </span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">&quot;John&quot;</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">, </span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">&quot;Jordan&quot;</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">]</span></div><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    </span><br class="m_-8459319842671557986webkit-block-placeholder gmail_msg"></p><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(0,132,0)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">    </span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">/// Loop over names, if no names, print no names</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">func</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> run()</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    {</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">for</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> name </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">in</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> </span><span style="font-variant-ligatures:no-common-ligatures;color:#4f8187" class="gmail_msg">names</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        {</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">            </span><span style="font-variant-ligatures:no-common-ligatures;color:#3e1e81" class="gmail_msg">print</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">(name)</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        }</span></div><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        </span><br class="m_-8459319842671557986webkit-block-placeholder gmail_msg"></p><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">if</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> </span><span style="font-variant-ligatures:no-common-ligatures;color:#4f8187" class="gmail_msg">names</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">.</span><span style="font-variant-ligatures:no-common-ligatures;color:#703daa" class="gmail_msg">count</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> == </span><span style="font-variant-ligatures:no-common-ligatures;color:#272ad8" class="gmail_msg">0</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        {</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">            </span><span style="font-variant-ligatures:no-common-ligatures;color:#3e1e81" class="gmail_msg">print</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">(</span><span style="font-variant-ligatures:no-common-ligatures;color:#d12f1b" class="gmail_msg">&quot;no names&quot;</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">)</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        }</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    }</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">}</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px" class="gmail_msg"><br class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"></span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">let</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> exampleOne = </span><span style="font-variant-ligatures:no-common-ligatures;color:#4f8187" class="gmail_msg">Example_1</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">()</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">exampleOne</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">.</span><span style="font-variant-ligatures:no-common-ligatures;color:#31595d" class="gmail_msg">run</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">()</span></div></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">However, Personally, I would find it more pleasing to write something like this:</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">class</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> Example_2_Proposed</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">{</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">let</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> names:[</span><span style="font-variant-ligatures:no-common-ligatures;color:#703daa" class="gmail_msg">String</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">] = []</span></div><p style="margin:0px;line-height:normal;min-height:13px" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    </span><br class="m_-8459319842671557986webkit-block-placeholder gmail_msg"></p><div style="margin:0px;line-height:normal;color:rgb(0,132,0)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">    </span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">/// Loop over names, if no names, print no names</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">func</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> run()</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    {</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">for</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> name </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">in</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> </span><span style="font-variant-ligatures:no-common-ligatures;color:#4f8187" class="gmail_msg">names</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        {</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">            </span><span style="font-variant-ligatures:no-common-ligatures;color:#3e1e81" class="gmail_msg">print</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">(name)</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        } </span><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">else</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"> {</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">            </span><span style="font-variant-ligatures:no-common-ligatures;color:#3e1e81" class="gmail_msg">print</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">(</span><span style="font-variant-ligatures:no-common-ligatures;color:#d12f1b" class="gmail_msg">&quot;no names&quot;</span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">)</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">        }</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">    }</span></div><div style="margin:0px;line-height:normal" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">}</span></div><div style="margin:0px;line-height:normal;min-height:13px" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg"></span><br class="gmail_msg"></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#ba2da2" class="gmail_msg">let</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"> exampleTwo = </span><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">Example_2_Proposed</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">()</span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures" class="gmail_msg">exampleTwo</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">.</span><span style="font-variant-ligatures:no-common-ligatures;color:#31595d" class="gmail_msg">run</span><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">()</span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">The difference here is a “for-else” type syntax where if there were no items in the array it would simply fall through to the else statement.</span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">What would be the pros/cons of introducing such syntax?</span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">Is there’s a way of doing something similar in swift already?</span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">Thanks</span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg">Chris</span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div><div style="margin:0px;line-height:normal;color:rgb(79,129,135)" class="gmail_msg"><span style="font-variant-ligatures:no-common-ligatures;color:#000000" class="gmail_msg"><br class="gmail_msg"></span></div></span></div></div>_______________________________________________<br class="gmail_msg">
swift-evolution mailing list<br class="gmail_msg">
<a href="mailto:swift-evolution@swift.org" class="gmail_msg" target="_blank">swift-evolution@swift.org</a><br class="gmail_msg">
<a href="https://lists.swift.org/mailman/listinfo/swift-evolution" rel="noreferrer" class="gmail_msg" target="_blank">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class="gmail_msg">
</blockquote></div>