000017-medium-replaceall

[yunliuyan]

ReplaceAll

by Anthony Fu @antfu

   

实现 ReplaceAll<S, From, To> 将一个字符串 S 中的所有子字符串 From 替换为 To。

例如

type replaced = ReplaceAll<'t y p e s', ' ', ''> // 期望是 'types'

[yunliuyan]

思路

基于replace进行递归

代码实现

type ReplaceAll<S extends string, From extends string, To extends string> = S extends '' ? '' : S extends `${infer L}${From}${infer R}` ? `${L}${ReplaceAll<`${To}${R}`, From, To>}` : S;

type replaced = ReplaceAll<'t y p e s', ' ', ''>; // 'types'

[Janice-Fan]

type ReplaceAll<S extends string, From extends string, To extends string> 
= From extends '' ? S : S extends `${infer X1}${From}${infer X2}` ? 
`${X1}${To}${ReplaceAll<X2, From, To>}` : S;

type replaceAll = ReplaceAll<'t y p e s', ' ', ''> // 期望是 'types'

[liangchengv]

type ReplaceAll<S extends string, From extends string, To extends string> = 
From extends '' ? S : S extends `${infer U}${From}${infer R}`? `${U}${To}${ReplaceAll<R, From, To>}` : S;

type replaced = ReplaceAll<'t y p e s', ' ', ''>

[wudu8]

type MyReplaceAll<S extends string, From extends string, To extends string> = S extends '' ? '' : S extends `${infer L}${From}${infer R}` ? `${L}${To}${MyReplaceAll<`${R}`, From, To>}` : S;

type replacedTest = MyReplaceAll<'t y p e s', ' ', ''>; // 'types'