ts学习笔记

摘要：如何学习一门语言是什么与的关系以面向对象的思维编程代码格式的流转我们在做什么强数据操作我们做的是由组件集组装起来的的质量取决于组件的质量什么是组件的质量怎样写出质量好的组件有什么是如何使得我们能产出高质量组件类型系统之原子类型类型系统之组

如何学习一门语言

以面向对象的思维编程?

// C-D 强数据操作
import { observable, action } from "mobx"

export default class StoreBase {
  service: any

  @observable state = ""
  @observable list = []
  @observable loading = false
  @observable totalCount = 0
  @observable counter = 0
  @observable pageSize = 10
  @observable pageIndex = 1
  @observable submiting = false
  @observable initialFormValue = {}

  constructor(service) {
    this.service = service
  }

  @action changeSize(pageSize) {
    this.pageSize = pageSize
  }

  @action async getPageList(options: { pageIndex?: number, pageSize?: number }) {
    options.pageIndex = options.pageIndex || this.pageIndex
    options.pageSize = options.pageSize || this.pageSize
    this.pageIndex = options.pageIndex
    this.pageSize = options.pageSize
    this.loading = true
    const result = await this.service.list(options)
    this.loading = false
    this.list = result.data
    this.totalCount = result.totalCount
  }

  @action async add(body) {
    this.submiting = true
    try {
      const result = await this.service.add(body)
      if (result.statusCode && result.statusCode !== 200) {
        throw new Error(result.message)
      }
    } catch (error) {
      throw error
    } finally {
      this.submiting = false
    }
  }

  @action async edit(id, body) {
    this.submiting = true
    try {
      const result = await this.service.update(id, body)
      if (result.statusCode && result.statusCode !== 200) {
        throw new Error(result.message)
      }
    } catch (error) {
      throw error
    } finally {
      this.submiting = false
    }
  }

  @action async remove(id) {
    try {
      await this.service.delete(id)
      this.getPageList({ pageIndex: this.pageIndex })
    } catch (error) {
      throw error
    }
  }

  @action initializeForm(form) {
    this.initialFormValue = form
  }
}

我们做的web application是由组件集组装起来的, application的质量取决于 组件的质量
什么是组件的质量? 怎样写出质量好的组件?

类型系统 之 原子类型

// boolean
let judge: boolean = true;

// string
let girl: string = `${family.join("======")}`;

// any
const think: any = {}
think = [];
think = "";
think = 1037;

// void
function select(): void { 
    return null;
}

// never
function logger(message: string): never { 
    throw new Error(message);
}

类型系统 之 组合类型

// 数组类型
let family: string[] = ["epuisite", "love", "detail"];
let team: Array = [1, 3, 7];
interface teamArray { 
    [index: number]: any
}
let t: teamArray = [1, 2, 3, {1: 3}];
// 元组
let structure: [string, Array];
structure = ["why", ["atomic element", "what"]];
structure[2] = "how";
structure[3] = ["when"];

// function类型
interface Doing { 
    (type: number, thing: string, when?: string|number): any[]
}

let mydoing: Doing;
function f(type: number = 2, thing?: string, when?: string|number, ...items: any[]) { 
    return type;
}

function sf(message: number): number;
function sf(message: string): string;
function sf(message: number | string): number | string { 
    if (message as number) {
        return 1;
    } else { 
        return "123";
    }
}

// 枚举类型  数字类型的值
const Color = {Red, Green, Blue};
enum Direction{  
    Up=1,  
    Down,  
    Left,  
    Right  
}  

// 自定义类型
// 对象类型 - 接口
interface Mother { 
    readonly id: number,
    detail: any[],
    learning: string,
    love: boolean,
    housework?: boolean,
    [proName: string]: any
}
let me: Mother = {
    id: new Date().getTime(),
    detail: ["water", 137, "cloud", "grass", "nose"],
    learning: "a wider world",
    love: true,
    doing() { 
        return 137;
    }
};

工具 是什么? 怎么用? 为什么用?

泛型

function createArray(length: number, value: T): Array { 
    let result: T[] = [];
    for (let i = 0; i < length; i++) { 
        result[i] = value;
    }
    return result;
}

function swap(tuple: [T, U]): [U, T] { 
    return [tuple[1], tuple[0]];
}


interface lengthwish { 
    length: number
}

function swap2(tuple: [T, U]): [U, T] { 
    return [tuple[1], tuple[0]];
}

interface createArrayFunc { 
    (length: number, value: T): Array;
}

let myCreateArray: createArrayFunc;
myCreateArray = function (length: number, value: T): Array[T] { 
    let result: T[] = [];
    for (let i = 0; i < length; i++) { 
        result[i] = value;
    }

    return result;
}

// 联合类型[共有的属性和方法 + 类型推论]
let cooperation: string | number | boolean | null | undefined;
cooperation = 1;
cooperation = null;



// 类型断言
function determine(config: number[] | string ): boolean {
    if ((config).length || (config).length) {
        return true;
    } else { 
        return false
    }
 }

type Name = string;
type DoFn = () => string;
type cof = Name | Dofn;
function o(message: cof): Name { 
    return "";
}