Zhentiw - 博客园

2020年2月26日

[TypeScript] as const, force immutability for Object type

摘要： Unlike JavaScript's const variable declarations, TypeScript allows you to create fully immutable types. In this lesson, we learn how to create immutab 阅读全文

posted @ 2020-02-26 00:25 Zhentiw 阅读(674) 评论(0) 推荐(0)

[Typescript] Using 'Pick' to create a sub-type from original type

摘要： There might be cases where you have selective data for your entities. Let's say that you are building a public API endpoint to get all the registered 阅读全文

posted @ 2020-02-26 00:15 Zhentiw 阅读(152) 评论(0) 推荐(0)

2020年2月25日

[Unit testing Angular] Complete component code

摘要： The component we test against: import {Component, OnInit} from '@angular/core'; import {Course} from "../model/course"; import {Observable} from "rxjs 阅读全文

posted @ 2020-02-25 19:55 Zhentiw 阅读(351) 评论(0) 推荐(0)

[Javascript] Objects and Functions

摘要： What makes objects different is that we can create more of them. Every time we use the {} object literal, we create a brand new object value: let shre 阅读全文

posted @ 2020-02-25 18:46 Zhentiw 阅读(105) 评论(0) 推荐(0)

[HTML5] Element id binding

摘要： When you give an element an id attr, it will automaticlly create a object with the same name of id: <form id="theform" action="/" method="post"> <labe 阅读全文

posted @ 2020-02-25 02:22 Zhentiw 阅读(148) 评论(0) 推荐(0)

2020年2月24日

[Javascript] You can't pass a variable

摘要： Let's see a simple code example: let pet = "dog" console.log(pet) We have console.log(pet) inside the code, when you read it, you might say: Pass ´pet 阅读全文

posted @ 2020-02-24 18:39 Zhentiw 阅读(142) 评论(0) 推荐(0)

2020年2月21日

[Javascript] Understanding the difference between .prototype and .__proto__ in JavaScript

摘要： It can be confusing to understand when and how the .prototype and .proto properties are created and used. They both seem to imply having something to 阅读全文

posted @ 2020-02-21 20:36 Zhentiw 阅读(205) 评论(0) 推荐(0)

[Javascript] let doesn't hoist -- false

摘要： "let" keyword, the same as "const" does hoist the variable. But different from 'var', it does both hoist and assign value as "undefined". "let" in oth 阅读全文

posted @ 2020-02-21 19:48 Zhentiw 阅读(114) 评论(0) 推荐(0)

[AST Babel Plugin] Hanlde ArrowFunction && FunctionExpression

摘要： Continue with previous post: https://www.cnblogs.com/Answer1215/p/12342540.html Now we need to think about functionExpression and ArrowFunction: funct 阅读全文

posted @ 2020-02-21 19:13 Zhentiw 阅读(464) 评论(0) 推荐(0)

[AST Babel] Add function name into the console log 'path.findParent(t.isFunctionDeclaration)'

摘要： Continue with the previous post: https://www.cnblogs.com/Answer1215/p/12337243.html What we want to do in this post, is adding parent function name in 阅读全文

posted @ 2020-02-21 18:41 Zhentiw 阅读(284) 评论(0) 推荐(0)

Answer1215

公告