Typescript類型體操 - EndsWith

題目

中文

實現EndsWith<T, U>,接收兩個 string 類型參數,然後判斷T是否以U結尾,根據結果返回true或false

例如:

type a = EndsWith<'abc', 'bc'>; // expected to be false
type b = EndsWith<'abc', 'abc'>; // expected to be true
type c = EndsWith<'abc', 'd'>; // expected to be false

English

Implement EndsWith<T, U> which takes two exact string types and returns whether T ends with U

For example:

type a = EndsWith<'abc', 'bc'>; // expected to be true
type b = EndsWith<'abc', 'abc'>; // expected to be true
type c = EndsWith<'abc', 'd'>; // expected to be false

答案

type EndsWith<T extends string, U extends string> = T extends `${any}${U}`
    ? true
    : false;

在線演示