Oliver Eyton-Williams ee1e8abd87

feat(curriculum): restore seed + solution to Chinese (#40683 )

* feat(tools): add seed/solution restore script

* chore(curriculum): remove empty sections' markers

* chore(curriculum): add seed + solution to Chinese

* chore: remove old formatter

* fix: update getChallenges

parse translated challenges separately, without reference to the source

* chore(curriculum): add dashedName to English

* chore(curriculum): add dashedName to Chinese

* refactor: remove unused challenge property 'name'

* fix: relax dashedName requirement

* fix: stray tag

Remove stray `pre` tag from challenge file.

Signed-off-by: nhcarrigan <nhcarrigan@gmail.com>

Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>

2021-01-12 19:31:00 -07:00

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id, title, challengeType, dashedName

id	title	challengeType	dashedName
af7588ade1100bde429baf20	寻找缺失的字母	5	missing-letters

--description--

在这道题目中，我们需要写一个函数，找出传入的字符串里缺失的字母并返回它。

判断缺失的依据是字母顺序。对于没有缺失的情况，请返回 undefined。

--hints--

fearNotLetter("abce") 应返回 "d"。

assert.deepEqual(fearNotLetter('abce'), 'd');

fearNotLetter("abcdefghjklmno") 应返回 "i"。

assert.deepEqual(fearNotLetter('abcdefghjklmno'), 'i');

fearNotLetter("stvwx") 应返回 "u"。

assert.deepEqual(fearNotLetter('stvwx'), 'u');

fearNotLetter("bcdf") 应返回 "e"。

assert.deepEqual(fearNotLetter('bcdf'), 'e');

fearNotLetter("abcdefghijklmnopqrstuvwxyz") 应返回 undefined。

assert.isUndefined(fearNotLetter('abcdefghijklmnopqrstuvwxyz'));

--seed--

--seed-contents--

function fearNotLetter(str) {
  return str;
}

fearNotLetter("abce");

--solutions--

function fearNotLetter (str) {
  for (var i = str.charCodeAt(0); i <= str.charCodeAt(str.length - 1); i++) {
    var letter = String.fromCharCode(i);
    if (str.indexOf(letter) === -1) {
      return letter;
    }
  }

  return undefined;
}

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