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112 - Capitalize Words

Answer TestCases

实现CapitalizeWords<T>，它将字符串的每个单词的第一个字母转换为大写，其余部分保持原样。

例如

type capitalized = CapitalizeWords<"hello world, my friends"> // 预期为 'Hello World, My Friends'

Solution

type CapitalizeWords<
  S extends string,
  W extends string = ''
> = S extends `${infer A}${infer B}`
  ? Uppercase<A> extends Lowercase<A>
    ? `${Capitalize<`${W}${A}`>}${CapitalizeWords<B>}`
    : CapitalizeWords<B, `${W}${A}`>
  : Capitalize<W>

Solution