Zhentiw - 博客园

2022年7月15日

摘要： Polling with setTimeout async function getNewMsgs() { let json; try { const res = await fetch("/poll"); json = await res.json(); } catch (e) { // back 阅读全文

posted @ 2022-07-15 19:10 Zhentiw 阅读(111) 评论(0) 推荐(0) 编辑

[Typescript] Type JQuery

摘要： const $: any = {} /** * Get the <button> element with the class 'continue' * and change its HTML to 'Next Step...' */ $("button.continue").html("Next 阅读全文

posted @ 2022-07-15 15:56 Zhentiw 阅读(30) 评论(0) 推荐(0) 编辑

2022年7月13日

[Typescript] Make Typescript Stick

摘要： Refer: https://www.cnblogs.com/Answer1215/p/15084496.html A string is a primitive value, and all primitive values are immutable. Q1: const a = "Fronte 阅读全文

posted @ 2022-07-13 18:53 Zhentiw 阅读(210) 评论(0) 推荐(0) 编辑

[TypeScript] Model a DataStore type

摘要： Given this code as starter: export interface DataEntity { id: string } export interface Movie extends DataEntity { director: string } export interface 阅读全文

posted @ 2022-07-13 18:52 Zhentiw 阅读(28) 评论(0) 推荐(0) 编辑

[Typescript] Checked index access

摘要： Problem when typing Dictionaries: type Dict<T> = { [K: string]: T } const d: Dict<string[]> = {} d.rhubarb.join(", ") // 💥 Even `d.rhubarb` is undefi 阅读全文

posted @ 2022-07-13 17:57 Zhentiw 阅读(23) 评论(0) 推荐(0) 编辑

[Typescript] Key remapping in mapped types by using `as` keyword V4.2

摘要： Since TypeScript v4.2, we can do remapping by using `as` keyword type Colors = "red" | "green" | "blue" type ColorSelector = { [K in Colors as `select 阅读全文

posted @ 2022-07-13 17:48 Zhentiw 阅读(27) 评论(0) 推荐(0) 编辑

[Javascript] String in Javascript

摘要： String in Javascript is immutable. Means that once they were created, they cannot be modified. This also means that simple operations like appending a 阅读全文

posted @ 2022-07-13 01:16 Zhentiw 阅读(50) 评论(0) 推荐(0) 编辑

2022年7月12日

[TypesScript] Template literal types

摘要： type Statistics = { [K in `${"median" | "mean"}Value`]?: number } Mappiing a sub type: // let winFns: "setInterval" | "setTimeout" type winFns = Extra 阅读全文

posted @ 2022-07-12 14:53 Zhentiw 阅读(27) 评论(0) 推荐(0) 编辑

[TypeScript] Thrown values as unknown V4

摘要： Main idea is enforce you to do type checking in catch block, because if you want to get Error stacktrace, the throw value should be an Error type, if 阅读全文

posted @ 2022-07-12 14:09 Zhentiw 阅读(19) 评论(0) 推荐(0) 编辑

[TypeScript] Class Property Inference from Constructors V4

摘要： This major convenience feature reduces the need for class field type annotations by inferring their types from assignments in the constructor. It’s im 阅读全文

posted @ 2022-07-12 14:04 Zhentiw 阅读(26) 评论(0) 推荐(0) 编辑

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