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82 lines
1.8 KiB
Markdown
82 lines
1.8 KiB
Markdown
---
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id: 691f7773cddba1caf1bf5ece
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title: "Challenge 135: Re: Fwd: Fw: Count"
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challengeType: 28
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dashedName: challenge-135
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---
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# --description--
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Given a string representing the subject line of an email, determine how many times the email has been forwarded or replied to.
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For simplicity, consider an email forwarded or replied to if the string contains any of the following markers (case-insensitive):
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- `"fw:"`
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- `"fwd:"`
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- `"re:"`
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Return the total number of occurrences of these markers.
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# --hints--
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`emailChainCount("Re: Meeting Notes")` should return `1`.
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```js
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assert.equal(emailChainCount("Re: Meeting Notes"), 1);
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```
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`emailChainCount("Meeting Notes")` should return `0`.
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```js
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assert.equal(emailChainCount("Meeting Notes"), 0);
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```
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`emailChainCount("Re: re: RE: rE: Meeting Notes")` should return `4`.
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```js
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assert.equal(emailChainCount("Re: re: RE: rE: Meeting Notes"), 4);
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```
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`emailChainCount("Re: Fwd: Re: Fw: Re: Meeting Notes")` should return `5`.
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```js
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assert.equal(emailChainCount("Re: Fwd: Re: Fw: Re: Meeting Notes"), 5);
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```
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`emailChainCount("re:Ref:fw:re:review:FW:Re:fw:report:Re:FW:followup:re:summary:Fwd:Re:fw:NextStep:RE:FW:re:Project:Fwd:Re:fw:Notes:RE:re:Update:FWD:Re:fw:Summary")` should return `23`.
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```js
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assert.equal(emailChainCount("re:Ref:fw:re:review:FW:Re:fw:report:Re:FW:followup:re:summary:Fwd:Re:fw:NextStep:RE:FW:re:Project:Fwd:Re:fw:Notes:RE:re:Update:FWD:Re:fw:Summary"), 23);
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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 emailChainCount(subject) {
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return subject;
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}
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```
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# --solutions--
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```js
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function emailChainCount(subject) {
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const markers = ["re:", "fwd:", "fw:"];
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const lower = subject.toLowerCase();
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let count = 0;
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for (const marker of markers) {
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let index = 0;
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while ((index = lower.indexOf(marker, index)) !== -1) {
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count++;
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index += marker.length;
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}
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}
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return count;
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}
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```
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