「重学TS 2.0 」TS 练习题第四十一题 about awesome-typescript

[sunboyZgz]

运用以前的Split和JoinStrArray

type Replace<
  S extends string,
  From extends string,
  To extends string
> = S extends `${infer H}${From}${infer R}` ? `${H}${To}${R}` : S;

type ReplaceAll<
  S extends string,
  From extends string,
  To extends string
> = JoinStrArray<Split<S, From>, To>;
type R01 = Replace<"", "", "">; // ''
type R11 = Replace<"foobar", "bar", "foo">; // "foofoo"
type R21 = Replace<"foobarbar", "bar", "foo">; // "foofoobar"
type R3 = ReplaceAll<"foobarfoobarob", "ob", "b">; // "fobarfobar"

[zhaoxiongfei]

// 实现 Replace 工具类型，用于实现字符串类型的替换操作。具体的使用示例如下所示：

type Replace<
  S extends string,
  From extends string,
  To extends string,
> = S extends `${infer H}${From}${infer T}` ? `${H}${To}${T}` : S;

type R0 = Replace<"", "", "">; // ''
type R1 = Replace<"foobar", "bar", "foo">; // "foofoo"
type R2 = Replace<"foobarbar", "bar", "foo">; // "foofoobar"
// 此外，继续实现 ReplaceAll 工具类型，用于实现替换所有满足条件的子串。具体的使用示例如下所示：

type ReplaceAll<
  S extends string,
  From extends string,
  To extends string,
> = S extends `${infer H}${From}${infer T}`
  ? `${ReplaceAll<H, From, To>}${To}${ReplaceAll<T, From, To>}`
  : S;

type R0 = ReplaceAll<"", "", "">; // ''
type R1 = ReplaceAll<"barfoo", "bar", "foo">; // "foofoo"
type R2 = ReplaceAll<"foobarbar", "bar", "foo">; // "foofoofoo"
type R3 = ReplaceAll<"foobarfoobar", "ob", "b">; // "fobarfobar"

思路: 利用extends 配合infer 配合字符串模板变量的写法就能提取出指定的子字符串，之后利用递归就可以ReplaceAll

[mingzhans]

type Replace<
  S extends string,
  From extends string,
  To extends string
> = S extends `${infer A}${From}${infer B}` ? `${A}${To}${B}` : S// 你的实现代码 
  
type R0 = Replace<'', '', ''> // ''
type R1 = Replace<'foobar', 'bar', 'foo'> // "foofoo"
type R2 = Replace<'foobarbar', 'bar', 'foo'> // "foofoobar"

type ReplaceAll<
  S extends string,
  From extends string,
  To extends string
> = S extends `${infer A}${From}${infer Rest}` ? `${A}${To}${ReplaceAll<Rest,From,To>}` : S// 你的实现代码 
  
type C0 = ReplaceAll<'', '', ''> // ''
type C1 = ReplaceAll<'foobar', 'bar', 'foo'> // "foofoo"
type C2 = ReplaceAll<'foobarbar', 'bar', 'foo'> // "foofoobar"
type C3 = ReplaceAll<'foobarfoobar', 'ob', 'b'> // "fobarfobar"

[jackwangwj]

// 先匹配${infer U}${From}{infer U}
// 然后替换
type Replace<
S extends string,
From extends string,
To extends string

= S extends ${infer Head}${From}${infer Tail} ?
${Head}${To}${Tail} : S
// 你的实现代码

type R0 = Replace<'', '', ''> // ''
type R1 = Replace<'foobar', 'bar', 'foo'> // "foofoo"
type R2 = Replace<'foobarbar', 'bar', 'foo'> // "foofoobar"

[jackwangwj]

// 先匹配${infer U}${From}{infer U}
// 然后替换
type Replace<
S extends string,
From extends string,
To extends string

= S extends ${infer Head}${From}${infer Tail} ?
${Head}${To}${Tail} : S
// 你的实现代码

type R0 = Replace<'', '', ''> // ''
type R1 = Replace<'foobar', 'bar', 'foo'> // "foofoo"
type R2 = Replace<'foobarbar', 'bar', 'foo'> // "foofoobar"

[jackwangwj]

// 在上一个Replace的基础上递归
// 此题有个陷阱，R3用例中"fobarfobar"，进一步替换可以变为"fbarfbar",
// 所以得处理下，Head部分和替换部分不参与递归
type ReplaceAll<
S extends string,
From extends string,
To extends string
> = S extends ${infer Head}${From}${infer Tail}
? ${Head}${To}${ReplaceAll<Tail, From, To>}
: S

type R0 = ReplaceAll<'', '', ''> // ''
type R1 = ReplaceAll<'barfoo', 'bar', 'foo'> // "foofoo"
type R2 = ReplaceAll<'foobarbar', 'bar', 'foo'> // "foofoofoo"
type R3 = ReplaceAll<'foobarfoobar', 'ob', 'b'> // "fobarfobar"

[ChangerHe]

// 实现 Replace 工具类型，用于实现字符串类型的替换操作

// 解法: 通过模板字符串结合infer即可完成替换
type Replace<
  S extends string,
  From extends string,
  To extends string
> = S extends `${infer F}${From}${infer L}` ? `${F}${To}${L}` : S

// 继续实现 ReplaceAll 工具类型，用于实现替换所有满足条件的子串

// 解法: 在replace的基础上, 递归对前后字符串进行处理即可
type ReplaceAll<
  S extends string,
  From extends string,
  To extends string
> = S extends `${infer F}${From}${infer L}` ? `${ReplaceAll<F, From, To>}${To}${ReplaceAll<L, From, To>}` : S

[ChuTingzj]

// 实现 Replace 工具类型，用于实现字符串类型的替换操作。具体的使用示例如下所示：
// type Replace<
//   S extends string,
//   From extends string,
//   To extends string
// > = // 你的实现代码
// type R0 = Replace<'', '', ''> // ''
// type R1 = Replace<'foobar', 'bar', 'foo'> // "foofoo"
// type R2 = Replace<'foobarbar', 'bar', 'foo'> // "foofoobar"

type Replace<S extends string, From extends string, To extends string> = S extends `${From}${infer Rest}`
  ? `${To}${Rest}`
  : S extends `${infer Head}${From}${infer Rest}`
  ? `${Head}${To}${Rest}`
  : S extends `${infer Head}${infer From}`
  ? `${Head}${To}`
  : S
type R0 = Replace<'', '', ''> // ''
type R11 = Replace<'foobar', 'bar', 'foo'> // "foofoo"
type R2 = Replace<'foobarbar', 'bar', 'foo'> // "foofoobar"

// 此外，继续实现 ReplaceAll 工具类型，用于实现替换所有满足条件的子串。具体的使用示例如下所示：
// type ReplaceAll<
//   S extends string,
//   From extends string,
//   To extends string
// > = // 你的实现代码
// type R0 = ReplaceAll<'', '', ''> // ''
// type R1 = ReplaceAll<'barfoo', 'bar', 'foo'> // "foofoo"
// type R2 = ReplaceAll<'foobarbar', 'bar', 'foo'> // "foofoofoo"
// type R3 = ReplaceAll<'foobarfoobar', 'ob', 'b'> // "fobarfobar"

type ReplaceAll<S extends string, From extends string, To extends string> = S extends `${From}`
  ? S
  : S extends `${From}${infer Rest}`
  ? `${To}${ReplaceAll<Rest, From, To>}`
  : S extends `${infer Head}${From}${infer Rest}`
  ? `${Head}${To}${ReplaceAll<Rest, From, To>}`
  : S extends `${infer Head}${infer From}`
  ? `${Head}${To}`
  : S
type R00 = ReplaceAll<'', '', ''> // ''
type R111 = ReplaceAll<'barfoo', 'bar', 'foo'> // "foofoo"
type R22 = ReplaceAll<'foobarbar', 'bar', 'foo'> // "foofoofoo"
type R33 = ReplaceAll<'foobarfoobar', 'ob', 'b'> // "fobarfobar"

[dolphin0618]

type Replace<
  S extends string,
  From extends string,
  To extends string
> = S extends `${infer A}${From}${infer B}` ? `${A}${To}${B}` : S

type ReplaceAll<
  S extends string,
  From extends string,
  To extends string
> = S extends `${infer A}${From}${infer B}` ? `${A}${To}${ReplaceAll<B, From, To>}` : S
  
type R0 = ReplaceAll<'', '', ''> // ''
type R1 = ReplaceAll<'barfoo', 'bar', 'foo'> // "foofoo"
type R2 = ReplaceAll<'foobarbar', 'bar', 'foo'> // "foofoofoo"
type R3 = ReplaceAll<'foobarfoobar', 'ob', 'b'> // "fobarfobar"