TypeScript Generics All In One
TypeScript Generics All In One
"use strict";
/**
*
* @author xgqfrms
* @license MIT
* @copyright xgqfrms
* @created 2022-02-07
* @modified
*
* @description generic
* @augments
* @example
* @link
*
*/
const log = console.log;
class Person<T> {
run(value: T) {
log('run', value);
}
static getName(value: T) {
// Static members cannot reference class type parameters.ts(2302)
}
}
const p = new Person<number>();
p.run(1);
p.run('1');
// Argument of type 'string' is not assignable to parameter of type 'number'.ts(2345)
// 泛型约束
interface Length {
length: number,
}
class Test<T extends Length> {
run(value: T) {
log('run', value);
}
getLength(len: T) {
log('length =', len, len.length);
}
}
const t = new Test<string>();
t.run('abc');
t.getLength('abc');
t.getLength(123);
// Argument of type 'number' is not assignable to parameter of type 'string'.ts(2345)
interface Len<T> {
length: T,
}
class Bug<T extends Len<T>> {
run(value: T) {
log('run', value);
}
getLength(len: T) {
log('length =', len, len.length);
}
}
// const t = new Bug<string>();
// Type 'string' does not satisfy the constraint 'Len<string>'.ts(2344)
// const t = new Bug<string[]>();
/*
Type 'string[]' does not satisfy the constraint 'Len<string[]>'.
Types of property 'length' are incompatible.
Type 'number' is not assignable to type 'string[]'.ts(2344)
*/
export {};
Promise
feat
https://github.com/microsoft/TypeScript-Website/issues/2256
(() => {
const tryLinks = document.querySelectorAll(`[class="playground-link"]`);
for (let item of tryLinks) {
item.target = "_blank";
}
})();
refs
https://www.typescriptlang.org/docs/handbook/generics.html
https://www.typescriptlang.org/docs/handbook/2/generics.html
https://www.typescriptlang.org/play
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