Zhentiw - 博客园

2020年11月17日

[React] Broadcaster + Operator + Listener pattern -- 19. useBroadcaster & useListener

摘要： Instead of always combining useState and useEffect, when can create a utility useBroadcaster hook which allows us to pass in a broadcaster. export let 阅读全文

posted @ 2020-11-17 22:30 Zhentiw 阅读(147) 评论(0) 推荐(0)

[Javascript] Broadcaster + Operator + Listener pattern -- 18. Create a Win Condition with a mapDone Operator

摘要： Many streams of events end when a certain condition is met. When we run into that condition, we'll want to pass down our own custom values. This lesso 阅读全文

posted @ 2020-11-17 02:40 Zhentiw 阅读(225) 评论(0) 推荐(0)

2020年11月15日

[Typescript Unit testing] Error Handling with Unknown

摘要： function somethingRisky() {} try { somethingRisky() } catch(err: unknown) { if (err instanceof Error) { console.log(err.stack) } else { console.log(er 阅读全文

posted @ 2020-11-15 22:56 Zhentiw 阅读(102) 评论(0) 推荐(0)

[Typescript v3.9] ts-expect-error

摘要： Typescript v3.9 introduces the @ts-expect-error assertion added to TypeScript 3.9. This assertion is more descriptive than @ts-ignore because, rather 阅读全文

posted @ 2020-11-15 22:45 Zhentiw 阅读(1094) 评论(0) 推荐(0)

[Typescript v4.1] Template type literals

摘要： type Corner = `${'top' | 'bottom'}-${ 'left' | 'right'}` type VerticalAlignment = "top" | "middle" | "bottom"; type HorizontalAlignment = "left" | "ce 阅读全文

posted @ 2020-11-15 22:25 Zhentiw 阅读(193) 评论(0) 推荐(0)

[Typescript v4] Tuple Types && Recursive types

摘要： ...T: type Foo<T extends any[]> = [boolean, ...T, boolean] In previous typescript version, you can only put '...T' to the last element of array. Put n 阅读全文

posted @ 2020-11-15 22:19 Zhentiw 阅读(146) 评论(0) 推荐(0)

2020年11月14日

[Typescript] Nullish Coalescing

摘要： class Foo { #name; constructor(rawName?: string) { this.#name = rawName ?? (no name) } log() { console.log(this.#name) } } Checking 'rawName' is nulli 阅读全文

posted @ 2020-11-14 18:11 Zhentiw 阅读(128) 评论(0) 推荐(0)

[Tools] Volta

摘要： Volta’s job is to manage your JavaScript command-line tools, such as node, npm, yarn, or executables shipped as part of JavaScript packages. Similar t 阅读全文

posted @ 2020-11-14 18:00 Zhentiw 阅读(131) 评论(0) 推荐(0)

2020年11月13日

[Spring Pattern] Builder pattern

摘要： First, let's see the code: // builder/Contact.java public class Contact { private String firstName; private String lastName; private String emailAddre 阅读全文

posted @ 2020-11-13 15:43 Zhentiw 阅读(112) 评论(0) 推荐(0)

2020年11月12日

[Javascript] Broadcaster + Operator + Listener pattern -- 17. Building a Word Matching Game

摘要： It's common for a user to enter values that you want to check against your pre-defined values. Let's make a demo of a word game to demonstrate one app 阅读全文

posted @ 2020-11-12 15:56 Zhentiw 阅读(167) 评论(0) 推荐(0)

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