摘要：如何學習一門語言是什么與的關系以面向對象的思維編程代碼格式的流轉我們在做什么強數據操作我們做的是由組件集組裝起來的的質量取決于組件的質量什么是組件的質量怎樣寫出質量好的組件有什么是如何使得我們能產出高質量組件類型系統之原子類型類型系統之組

如何學習一門語言

以面向對象的思維編程?

// C-D 強數據操作
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
  }
}

我們做的web application是由組件集組裝起來的, application的質量取決于 組件的質量
什么是組件的質量? 怎樣寫出質量好的組件?

類型系統 之 原子類型

// 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);
}

類型系統 之 組合類型

// 數組類型
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}];
// 元組
let structure: [string, Array];
structure = ["why", ["atomic element", "what"]];
structure[2] = "how";
structure[3] = ["when"];

// function類型
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";
    }
}

// 枚舉類型  數字類型的值
const Color = {Red, Green, Blue};
enum Direction{  
    Up=1,  
    Down,  
    Left,  
    Right  
}  

// 自定義類型
// 對象類型 - 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? 為什么用?

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;
}

// 聯合類型[共有的屬性和方法 + 類型推論]
let cooperation: string | number | boolean | null | undefined;
cooperation = 1;
cooperation = null;



// 類型斷言
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 "";
}