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POAbsolutely-DRY conditionals in a language that doesn't allow goto?
 

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  1. POAbsolutely-DRY conditionals in a language that doesn't allow goto?
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    <p>How do you fake conditionals that don't nest in a language that doesn't allow goto? I want to do the following:</p> <pre><code>if (condition1) action1; if (!condition1 &amp;&amp; condition2) action2; if (!condition2 &amp;&amp; condition3) action3; </code></pre> <p>Without:</p> <ol> <li>Needlessly evaluating any condition more than once.</li> <li>Needlessly storing the result of any such evaluation in a variable.</li> <li>Needlessly specifying more than once that any action should be performed.</li> </ol> <p>The original snippet fails to meet requirement 1.</p> <p>The following snippet fails to meet requirement 2:</p> <pre><code>if (condition1) { action1; c2 = false; } else if (c2 = condition2) action2; if (!c2 &amp;&amp; condition3) action3; </code></pre> <p>And the following snippet fails to meet requirement 3:</p> <pre><code>if (condition1) { action1; if (condition3) action3; } else if (condition2) action2; else if (condition3) action3; </code></pre> <hr> <p><strong>EDIT:</strong></p> <ol> <li><p>It is impossible that <code>condition1</code> and <code>condition2</code> be true simultaneously.</p></li> <li><p>It is impossible that <code>condition2</code> and <code>condition3</code> be true simultaneously.</p></li> </ol> <p>Here is the original code (in JavaScript):</p> <pre><code>// If only the array of elements was specified, // wrap it inside an object. if (info.constructor !== Object) info = {children: info}; // If no array of elements was specified, create // an empty array of elements. if (!info.children) info.children = []; // If, instead of an array of elements, we have // a single element, wrap it inside an array. if (info.children.constructor !== Array) info.children = [info.children]; </code></pre>
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    1. CODoesn't your third example also violate the constraint against nested conditionals?
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    2. COI don't have any constraints against nested conditionals. My only constraints are: "Don't write code more than once" (original restriction 3) and "Don't execute what doesn't have to be executed" (original restrictions 1 and 2).
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    3. COAh, I misunderstood. What does the title of the post mean?
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