标签:Typescript _____________ 28 Replace Challenges extends Expect type infer
Implement Replace<S, From, To>
which replace the string From
with To
once in the given string S
For example
type replaced = Replace<'types are fun!', 'fun', 'awesome'> // expected to be 'types are awesome!'
/* _____________ Your Code Here _____________ */
type Replace<S extends string, From extends string, To extends string> = S extends `${infer P1}${From}${infer P2}`
? From extends ''
? S
: `${P1}${To}${P2}`
: S
type x = Replace<'foobarbar', '', 'foo'>
/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Replace<'foobar', 'bar', 'foo'>, 'foofoo'>>,
Expect<Equal<Replace<'foobarbar', 'bar', 'foo'>, 'foofoobar'>>,
Expect<Equal<Replace<'foobarbar', '', 'foo'>, 'foobarbar'>>,
Expect<Equal<Replace<'foobarbar', 'bar', ''>, 'foobar'>>,
Expect<Equal<Replace<'foobarbar', 'bra', 'foo'>, 'foobarbar'>>,
Expect<Equal<Replace<'', '', ''>, ''>>,
]
You can also check whether From
is ''
in the first place.
type Replace<S extends string, From extends string, To extends string> =
From extends '' ? S : S extends `${infer A}${From}${infer B}` ? `${A}${To}${B}` : S;
标签:Typescript,_____________,28,Replace,Challenges,extends,Expect,type,infer 来源: https://www.cnblogs.com/Answer1215/p/16686464.html
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