79d9012432
* fix(curriculum): tests quotes * fix(curriculum): fill seed-teardown * fix(curriculum): fix tests and remove unneeded seed-teardown
93 lines
3.2 KiB
Markdown
93 lines
3.2 KiB
Markdown
---
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title: Comma quibbling
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id: 596e414344c3b2872167f0fe
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challengeType: 5
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---
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## Description
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<section id='description'>
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<p>Comma quibbling is a task originally set by Eric Lippert in his <a href="http://blogs.msdn.com/b/ericlippert/archive/2009/04/15/comma-quibbling.aspx" title="link: http://blogs.msdn.com/b/ericlippert/archive/2009/04/15/comma-quibbling.aspx">blog</a>.</p>
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Task:<p>Write a function to generate a string output which is the concatenation of input words from a list/sequence where:</p>
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An input of no words produces the output string of just the two brace characters "{}".
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An input of just one word, e.g. ["ABC"], produces the output string of the word inside the two braces, e.g. "{ABC}".
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An input of two words, e.g. ["ABC", "DEF"], produces the output string of the two words inside the two braces with the words separated by the string " and ", e.g. "{ABC and DEF}".
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An input of three or more words, e.g. ["ABC", "DEF", "G", "H"], produces the output string of all but the last word separated by ", " with the last word separated by " and " and all within braces; e.g. "{ABC, DEF, G and H}".
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<p>Test your function with the following series of inputs showing your output here on this page:</p>
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[] # (No input words).
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["ABC"]
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["ABC", "DEF"]
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["ABC", "DEF", "G", "H"]
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<p>Note: Assume words are non-empty strings of uppercase characters for this task.</p>
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>quibble</code> is a function.
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testString: assert(typeof quibble === 'function', '<code>quibble</code> is a function.');
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- text: <code>quibble(["ABC"])</code> should return a string.
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testString: assert(typeof quibble(["ABC"]) === 'string', '<code>quibble(["ABC"])</code> should return a string.');
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- text: <code>quibble([])</code> should return "{}".
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testString: assert.equal(quibble(testCases[0]), results[0], '<code>quibble([])</code> should return "{}".');
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- text: <code>quibble(["ABC"])</code> should return "{ABC}".
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testString: assert.equal(quibble(testCases[1]), results[1], '<code>quibble(["ABC"])</code> should return "{ABC}".');
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- text: <code>quibble(["ABC", "DEF"])</code> should return "{ABC and DEF}".
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testString: assert.equal(quibble(testCases[2]), results[2], '<code>quibble(["ABC", "DEF"])</code> should return "{ABC and DEF}".');
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- text: <code>quibble(["ABC", "DEF", "G", "H"])</code> should return "{ABC,DEF,G and H}".
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testString: assert.equal(quibble(testCases[3]), results[3], '<code>quibble(["ABC", "DEF", "G", "H"])</code> should return "{ABC,DEF,G and H}".');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function quibble (words) {
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// Good luck!
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return true;
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}
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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const testCases = [[], ["ABC"], ["ABC", "DEF"], ["ABC", "DEF", "G", "H"]];
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const results = ["{}", "{ABC}", "{ABC and DEF}", "{ABC,DEF,G and H}"];
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function quibble (words) {
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return "{" +
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words.slice(0, words.length - 1).join(",") +
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(words.length > 1 ? " and " : "") +
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(words[words.length - 1] || '') +
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"}";
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}
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```
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</section>
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