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CamelCase

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type CamelCase<S extends string, Res extends string = ""> =
  S extends `_${infer L}${infer R}`
    ? CamelCase<R, `${Res}${Uppercase<L>}`>
  : S extends `${infer L}${infer R}`
    ? L extends string
      ? CamelCase<R, `${Res}${Lowercase<L>}`>
    : Res
  : Res
提出日時2023-08-08 18:21:30
問題CamelCase
ユーザーookkoouu
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<CamelCase<'foobar'>, 'foobar'>>,
  Expect<Equal<CamelCase<'FOOBAR'>, 'foobar'>>,
  Expect<Equal<CamelCase<'foo_bar'>, 'fooBar'>>,
  Expect<Equal<CamelCase<'foo_bar_hello_world'>, 'fooBarHelloWorld'>>,
  Expect<Equal<CamelCase<'HELLO_WORLD_WITH_TYPES'>, 'helloWorldWithTypes'>>,
  Expect<Equal<CamelCase<'-'>, '-'>>,
  Expect<Equal<CamelCase<''>, ''>>,
  Expect<Equal<CamelCase<'😎'>, '😎'>>,
]