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70 lines
1.8 KiB
Markdown
70 lines
1.8 KiB
Markdown
---
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id: 69f35a5bb823ed620fcb7cbd
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title: "Challenge 284: I Before E"
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challengeType: 28
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dashedName: challenge-284
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---
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# --description--
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Given a word or sentence, return a corrected version where every word follows the "I before E except after C" rule.
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- If a word contains `"ei"` not preceded by `"c"`, replace it with `"ie"`.
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- If a word contains `"ie"` preceded by `"c"`, replace it with `"ei"`.
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- All other words are left unchanged.
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# --hints--
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`iBeforeE("beleive")` should return `"believe"`.
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```js
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assert.equal(iBeforeE("beleive"), "believe");
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```
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`iBeforeE("recieve")` should return `"receive"`.
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```js
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assert.equal(iBeforeE("recieve"), "receive");
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```
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`iBeforeE("we recieved a breif")` should return `"we received a brief"`.
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```js
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assert.equal(iBeforeE("we recieved a breif"), "we received a brief");
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```
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`iBeforeE("she beleived the friendly niece could percieve the greif")` should return `"she believed the friendly niece could perceive the grief"`.
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```js
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assert.equal(iBeforeE("she beleived the friendly niece could percieve the greif"), "she believed the friendly niece could perceive the grief");
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```
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`iBeforeE("we recieved relief after the theif gave us a breif piece of feirce deceit")` should return `"we received relief after the thief gave us a brief piece of fierce deceit"`.
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```js
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assert.equal(iBeforeE("we recieved relief after the theif gave us a breif piece of feirce deceit"), "we received relief after the thief gave us a brief piece of fierce deceit");
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```
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# --seed--
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## --seed-contents--
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```js
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function iBeforeE(sentence) {
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return sentence;
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}
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```
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# --solutions--
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```js
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function iBeforeE(sentence) {
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return sentence.split(' ').map(word => {
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word = word.replace(/([^c])ei/g, '$1ie');
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word = word.replace(/cie/g, 'cei');
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return word;
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}).join(' ');
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}
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```
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