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class Foo { bar() {} } const bar = new Foo() console.log(bar instanceof Foo) // true console.log(Object.getPrototypeOf(bar) Foo.prototype) // true cla 阅读全文
posted @ 2020-10-04 01:16
Zhentiw
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"Record" repersent key-value pair. type MyRecord<K extend string, T> = { [P in K]: T } Record key should be string. array[0] in javascript, even we gi 阅读全文
posted @ 2020-10-01 19:01
Zhentiw
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For example we have interface: interface Person { name: string, age?: number } 'age' is an optional prop. // will have an error since person.age is us 阅读全文
posted @ 2020-10-01 18:50
Zhentiw
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type MyPartial<T> = { [P in keyof T]?: T[P] } 'in' like a loop. Usage: function updatePerson(person: Person, prop: MyPartial<Person>) { return {...per 阅读全文
posted @ 2020-10-01 18:42
Zhentiw
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interface Person { name: string; age: number; address: {} } // gives error since we didn't define 'address' const person: Person = { name: "Wan", age: 阅读全文
posted @ 2020-10-01 15:04
Zhentiw
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interface Person { name: string; age: number; } interface ReadonlyPerson { readonly name: string; readonly age: number; } const person: ReadonlyPerson 阅读全文
posted @ 2020-10-01 14:51
Zhentiw
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const person = { name: "wan", age: 28 } type Person = typeof person type PersonKeys = keyof person // "name" | "age" type PersonKTypes = Person[Person 阅读全文
posted @ 2020-09-30 20:20
Zhentiw
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In Javascript, you know typeof: typeof [] // object typeof "" // string In Typescript it is more smart: const person = { name: "wan", age: 28 } type P 阅读全文
posted @ 2020-09-30 20:11
Zhentiw
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import { compose } from "ramda"; let input = document.getElementById("input"); let inputBroadcaster = (listener) => { input.addEventListener("input", 阅读全文
posted @ 2020-09-30 18:32
Zhentiw
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import { compose } from "ramda"; let input = document.getElementById("input"); let inputBroadcaster = (listener) => { input.addEventListener("input", 阅读全文
posted @ 2020-09-30 18:12
Zhentiw
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