mirror of
https://github.com/freeCodeCamp/freeCodeCamp.git
synced 2026-03-28 23:01:57 -04:00
162 lines
3.4 KiB
Markdown
162 lines
3.4 KiB
Markdown
---
|
|
id: 5a23c84252665b21eecc8017
|
|
title: Soundex
|
|
challengeType: 1
|
|
forumTopicId: 302320
|
|
dashedName: soundex
|
|
---
|
|
|
|
# --description--
|
|
|
|
**Soundex Algorithm** deals with the *intentions* of the words. It creates a representation for similar sounding words.
|
|
|
|
It is used for searching <em>names</em> and <em>addresses</em>. This means that the person who filled in the <em>name</em>, can focus on how it sounds instead of correcting the spelling of <em>names</em>.
|
|
|
|
Zum Beispiel:
|
|
|
|
If you are hearing the name `Quenci` for the first time, and misspelled it, you will get **Soundex** code `Q520`.
|
|
|
|
When you spell the name `Quincy` correctly next time, you will still get the same code `Q520`, which means you can link multiple name pronunciations into the same <em>person</em> without the need for adding every spelling.
|
|
|
|
Hier sind die Regeln:
|
|
|
|
<ul>
|
|
<li>If a vowel (A, E, I, O, U) separates two consonants that have the same soundex code, the consonant to the right of the vowel is coded. Tymczak is coded as T-522 (T, 5 for the M, 2 for the C, Z ignored (see "Side-by-Side" rule above), 2 for the K). Since the vowel "A" separates the Z and K, the K is coded.</li>
|
|
<li>If "H" or "W" separate two consonants that have the same soundex code, the consonant to the right of the vowel is not coded. Example: Ashcraft is coded A-261 (A, 2 for the S, C ignored, 6 for the R, 1 for the F). It is not coded A-226.</li>
|
|
</ul>
|
|
|
|
# --instructions--
|
|
|
|
Write a function that takes a string as a parameter and returns the encoded string.
|
|
|
|
# --hints--
|
|
|
|
`soundex` sollte eine Funktion sein.
|
|
|
|
```js
|
|
assert(typeof soundex == 'function');
|
|
```
|
|
|
|
`soundex("Soundex")` sollte einen String zurückgeben.
|
|
|
|
```js
|
|
assert(typeof soundex('Soundex') == 'string');
|
|
```
|
|
|
|
`soundex("Soundex")` sollte `"S532"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Soundex'), 'S532');
|
|
```
|
|
|
|
`soundex("Example")` sollte `"E251"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Example'), 'E251');
|
|
```
|
|
|
|
`soundex("Sownteks")` sollte `"S532"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Sownteks'), 'S532');
|
|
```
|
|
|
|
`soundex("Ekzampul")` sollte `"E251"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Ekzampul'), 'E251');
|
|
```
|
|
|
|
`soundex("Euler")` sollte `"E460"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Euler'), 'E460');
|
|
```
|
|
|
|
`soundex("Gauss")` sollte `"G200"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Gauss'), 'G200');
|
|
```
|
|
|
|
`soundex("Hilbert")` sollte `"H416"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Hilbert'), 'H416');
|
|
```
|
|
|
|
`soundex("Knuth")` sollte `"K530"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Knuth'), 'K530');
|
|
```
|
|
|
|
`soundex("Lloyd")` sollte `"L300"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Lloyd'), 'L300');
|
|
```
|
|
|
|
`soundex("Lukasiewicz")` sollte `"L222"` zurückgeben.
|
|
|
|
```js
|
|
assert.equal(soundex('Lukasiewicz'), 'L222');
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
function soundex(s) {
|
|
|
|
}
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
function soundex(s) {
|
|
var a = s.toLowerCase().split('');
|
|
var f = a.shift(),
|
|
r = '',
|
|
codes = {
|
|
a: '',
|
|
e: '',
|
|
i: '',
|
|
o: '',
|
|
u: '',
|
|
b: 1,
|
|
f: 1,
|
|
p: 1,
|
|
v: 1,
|
|
c: 2,
|
|
g: 2,
|
|
j: 2,
|
|
k: 2,
|
|
q: 2,
|
|
s: 2,
|
|
x: 2,
|
|
z: 2,
|
|
d: 3,
|
|
t: 3,
|
|
l: 4,
|
|
m: 5,
|
|
n: 5,
|
|
r: 6
|
|
};
|
|
r =
|
|
f +
|
|
a
|
|
.map(function(v, i, a) {
|
|
return codes[v];
|
|
})
|
|
.filter(function(v, i, a) {
|
|
return i === 0 ? v !== codes[f] : v !== a[i - 1];
|
|
})
|
|
.join('');
|
|
|
|
return (r + '000').slice(0, 4).toUpperCase();
|
|
}
|
|
```
|