TS
TypeScript オンライン

00651-hard-length-of-string-2
Hard
template-literal

チャレンジのソース: type-challenges/00651-hard-length-of-string-2

テンプレート文字列の長さを計算するLengthOfString<S>を実装します。(298 - Length of Stringと同じような型):

type T0 = LengthOfString<'foo'>; // 3

この課題で実装する型は、数百文字の長さの文字列をサポートしなければなりません(通常の再帰的な文字列長の計算は、TS の再帰的な関数呼び出しの深さによって制限されています、つまり、45 文字程度までの文字列をサポートしています)。

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テストケースの出典: type-challenges/00651-hard-length-of-string-2/test-cases.ts
import type { Equal, IsTrue } from '@type-challenges/utils'

type cases = [
  IsTrue<Equal<LengthOfString<''>, 0>>,
  IsTrue<Equal<LengthOfString<'1'>, 1>>,
  IsTrue<Equal<LengthOfString<'12'>, 2>>,
  IsTrue<Equal<LengthOfString<'123'>, 3>>,
  IsTrue<Equal<LengthOfString<'1234'>, 4>>,
  IsTrue<Equal<LengthOfString<'12345'>, 5>>,
  IsTrue<Equal<LengthOfString<'123456'>, 6>>,
  IsTrue<Equal<LengthOfString<'1234567'>, 7>>,
  IsTrue<Equal<LengthOfString<'12345678'>, 8>>,
  IsTrue<Equal<LengthOfString<'123456789'>, 9>>,
  IsTrue<Equal<LengthOfString<'1234567890'>, 10>>,
  IsTrue<Equal<LengthOfString<'12345678901'>, 11>>,
  IsTrue<Equal<LengthOfString<'123456789012'>, 12>>,
  IsTrue<Equal<LengthOfString<'1234567890123'>, 13>>,
  IsTrue<Equal<LengthOfString<'12345678901234'>, 14>>,
  IsTrue<Equal<LengthOfString<'123456789012345'>, 15>>,
  IsTrue<Equal<LengthOfString<'1234567890123456'>, 16>>,
  IsTrue<Equal<LengthOfString<'12345678901234567'>, 17>>,
  IsTrue<Equal<LengthOfString<'123456789012345678'>, 18>>,
  IsTrue<Equal<LengthOfString<'1234567890123456789'>, 19>>,
  IsTrue<Equal<LengthOfString<'12345678901234567890'>, 20>>,
  IsTrue<Equal<LengthOfString<'123456789012345678901'>, 21>>,
  IsTrue<Equal<LengthOfString<'1234567890123456789012'>, 22>>,
  IsTrue<Equal<LengthOfString<'12345678901234567890123'>, 23>>,
  IsTrue<Equal<LengthOfString<'aaaaaaaaaaaaggggggggggggggggggggkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'>, 272>>,
  IsTrue<Equal<LengthOfString<'000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'>, 999>>,
]