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curriculum/challenges/english/10-coding-interview-prep/rosetta-code/comma-quibbling.md

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+---
+title: Comma quibbling
+id: 596e414344c3b2872167f0fe
+challengeType: 5
+forumTopicId: 302234
+---
+
+## Description
+<section id='description'>
+Comma quibbling is a task originally set by Eric Lippert in his <a href="https://blogs.msdn.com/b/ericlippert/archive/2009/04/15/comma-quibbling.aspx" target="_blank">blog</a>.
+</section>
+
+## Instructions
+<section id='instructions'>
+Write a function to generate a string output which is the concatenation of input words from a list/sequence where:
+<ol>
+  <li>An input of no words produces the output string of just the two brace characters (<code>"{}"</code>)</li>
+  <li>An input of just one word, e.g. <code>["ABC"]</code>, produces the output string of the word inside the two braces, e.g. <code>"{ABC}"</code></li>
+  <li>An input of two words, e.g. <code>["ABC", "DEF"]</code>, produces the output string of the two words inside the two braces with the words separated by the string <code>" and "</code>, e.g. <code>"{ABC and DEF}"</code></li>
+  <li>An input of three or more words, e.g. <code>["ABC", "DEF", "G", "H"]</code>, produces the output string of all but the last word separated by <code>", "</code> with the last word separated by <code>" and "</code> and all within braces; e.g. <code>"{ABC, DEF, G and H}"</code></li>
+</ol>
+Test your function with the following series of inputs showing your output here on this page:
+<ul>
+  <li>[] # (No input words).</li>
+  <li>["ABC"]</li>
+  <li>["ABC", "DEF"]</li>
+  <li>["ABC", "DEF", "G", "H"]</li>
+</ul>
+<strong>Note:</strong> Assume words are non-empty strings of uppercase characters for this task.
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>quibble</code> should be a function.
+    testString: assert(typeof quibble === 'function');
+  - text: <code>quibble(["ABC"])</code> should return a string.
+    testString: assert(typeof quibble(["ABC"]) === 'string');
+  - text: <code>quibble([])</code> should return "{}".
+    testString: assert.equal(quibble(testCases[0]), results[0]);
+  - text: <code>quibble(["ABC"])</code> should return "{ABC}".
+    testString: assert.equal(quibble(testCases[1]), results[1]);
+  - text: <code>quibble(["ABC", "DEF"])</code> should return "{ABC and DEF}".
+    testString: assert.equal(quibble(testCases[2]), results[2]);
+  - text: <code>quibble(["ABC", "DEF", "G", "H"])</code> should return "{ABC,DEF,G and H}".
+    testString: assert.equal(quibble(testCases[3]), results[3]);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function quibble(words) {
+
+  return true;
+}
+```
+
+</div>
+
+
+### After Test
+<div id='js-teardown'>
+
+```js
+const testCases = [[], ["ABC"], ["ABC", "DEF"], ["ABC", "DEF", "G", "H"]];
+const results = ["{}", "{ABC}", "{ABC and DEF}", "{ABC,DEF,G and H}"];
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+function quibble(words) {
+  return "{" +
+    words.slice(0, words.length - 1).join(",") +
+   (words.length > 1 ? " and " : "") +
+   (words[words.length - 1] || '') +
+  "}";
+}
+
+```
+
+</section>