102 lines
2.6 KiB
Markdown
102 lines
2.6 KiB
Markdown
|
---
|
||
|
|
id: 596e414344c3b2872167f0fe
|
||
|
|
title: Comma quibbling
|
||
|
|
challengeType: 5
|
||
|
|
forumTopicId: 302234
|
||
|
|
dashedName: comma-quibbling
|
||
|
|
---
|
||
|
|
|
||
|
|
# --description--
|
||
|
|
|
||
|
|
Comma quibbling is a task originally set by Eric Lippert in his [blog](https://blogs.msdn.com/b/ericlippert/archive/2009/04/15/comma-quibbling.aspx).
|
||
|
|
|
||
|
|
# --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>
|
||
|
|
|
||
|
|
**Note:** Assume words are non-empty strings of uppercase characters for this task.
|
||
|
|
|
||
|
|
# --hints--
|
||
|
|
|
||
|
|
`quibble` should be a function.
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert(typeof quibble === 'function');
|
||
|
|
```
|
||
|
|
|
||
|
|
`quibble(["ABC"])` should return a string.
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert(typeof quibble(['ABC']) === 'string');
|
||
|
|
```
|
||
|
|
|
||
|
|
`quibble([])` should return "{}".
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert.equal(quibble(testCases[0]), results[0]);
|
||
|
|
```
|
||
|
|
|
||
|
|
`quibble(["ABC"])` should return "{ABC}".
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert.equal(quibble(testCases[1]), results[1]);
|
||
|
|
```
|
||
|
|
|
||
|
|
`quibble(["ABC", "DEF"])` should return "{ABC and DEF}".
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert.equal(quibble(testCases[2]), results[2]);
|
||
|
|
```
|
||
|
|
|
||
|
|
`quibble(["ABC", "DEF", "G", "H"])` should return "{ABC,DEF,G and H}".
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert.equal(quibble(testCases[3]), results[3]);
|
||
|
|
```
|
||
|
|
|
||
|
|
# --seed--
|
||
|
|
|
||
|
|
## --after-user-code--
|
||
|
|
|
||
|
|
```js
|
||
|
|
const testCases = [[], ["ABC"], ["ABC", "DEF"], ["ABC", "DEF", "G", "H"]];
|
||
|
|
const results = ["{}", "{ABC}", "{ABC and DEF}", "{ABC,DEF,G and H}"];
|
||
|
|
```
|
||
|
|
|
||
|
|
## --seed-contents--
|
||
|
|
|
||
|
|
```js
|
||
|
|
function quibble(words) {
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
# --solutions--
|
||
|
|
|
||
|
|
```js
|
||
|
|
function quibble(words) {
|
||
|
|
return "{" +
|
||
|
|
words.slice(0, words.length - 1).join(",") +
|
||
|
|
(words.length > 1 ? " and " : "") +
|
||
|
|
(words[words.length - 1] || '') +
|
||
|
|
"}";
|
||
|
|
}
|
||
|
|
```
|