Use of typescript dictionary

because typescript Similar information is not provided directly map Key value pair data structure for us to use , So we can use some special ways to achieve the purpose we need ：

1. establish ：
let dic : {[key:string]:number} = {};
Use the above statement to create a key of type string, The type of value is number Dictionary

2. add to ：
dic[“zien”] = 23;
dic.clz = 13;
You can add key values in both ways

3. Delete ：
delete dic[“zien”];

4. lookup ：
for(let key in dic){
let value = dic[key]
}

The routine addition, deletion, modification and check are roughly the same , The above is basically typescript The original method , Through simple application to achieve similar Dictionaries The use effect of .
If you want to realize the dictionary function you want more dynamically , You can encapsulate a class according to your project needs to realize the functions you want , Such as ：

export default class Dictionary {
    
  items: object;
  constructor() {
    
    this.items = {
    };
  }
  has(key: any): boolean {
    
    return this.items.hasOwnProperty(key);
  }
  set(key: any, val: any) {
    
    this.items[key] = val;
  }
  delete(key: any): boolean {
    
    if (this.has(key)) {
    
      delete this.items[key];
    }
    return false;
  }
  get(key: any): any {
    
    return this.has(key) ? this.items[key] : undefined;
  }
  values(): any[] {
    
    let values: any[] = [];
    for (let k in this.items) {
    
      if (this.has(k)) {
    
        values.push(this.items[k]);
      }
    }
    return values;
  }
}

Reference material ：
https://www.jianshu.com/p/48281bfff687