db-country/index.js

In-memory countries' database

((api,m,rq)=>{
    ((ETL,JFile)=>{

       api.db={};
       api.db.meta={};
       api.db.meta.cols_countries=['name_en','name_de','name_local','code','continent','capital','population',
       'area','coastline','gov','currency','currency_code','dialing_prefix','birthrate',
       'deathrate','life_expect','url'];
       api.db.countries=ETL.extract(`${__dirname}/db/countries.csv`,{
         delimitor:';',
         ignore:(line,index)=>index>=1 && line.length>10,
         headers:api.db.meta.cols_countries}).map((e)=>{
              let ee=e;
              Object.keys(e).forEach((k)=>ee[k]=e[k].replace('"','').replace('"',''))
              return ee;
       });

       class _{
         constructor(o){
           Object.keys(o).forEach((p)=>this[p]=o[p]);
         }

         static groupBy(p){
             return api.db.countries.groupBy(p);
         };

         toString(){
            return JSON.stringify(this);
         }
         persist(file,append){
              file=new JFile(file);
             (append)?file.text+=`\n${this.toString()}`:file.text=this.toString();
         }
         static size(){
           return api.db.countries.length;
         }
         static get(id){
          return (isFinite(id)?api.db.countries[id-1]:this.findBy('name_en',id)[0])
         }
         static from(db){
            return db.map((o)=>new this(o));
         };
         static findBy(p,v){
             if(p==='name'){p='name_en'}
            if(p=='name_en'&&v.toLowerCase()==='israel'){v="Palestine"};
            return api.db.countries.filter((c)=>(isFinite(c[p])?parseInt(c[p])===v:c[p].toLowerCase() ===v.toLowerCase()));
         };
         static find(f){
           return api.db.countries.filter((e,i)=>f(e,i,api.db.meta.cols_countries));
         };
         static findGE(p,v){
             return api.db.countries.filter((c)=>(isFinite(c[p])?parseFloat(c[p])>=v:c[p].toLowerCase() ===v.toLowerCase()));
         }
         static findLE(p,v){
           return api.db.countries.filter((c)=>(isFinite(c[p])?parseFloat(c[p])<=v:c[p].toLowerCase() ===v.toLowerCase()));

         }
         static findAround(p,min,max){
           return api.db.countries.filter((c)=>(isFinite(c[p])?parseFloat(c[p])>=min && parseFloat(c[p])<=max :c[p].toLowerCase() ===v.toLowerCase()));

         }

         static findAll(){
             return api.db.countries;
         };
        static persist(file,append){
                     file=new JFile(file),content=this.from(api.db.countries).map((c)=>c.toString()).join('\n');
                     (append)?file.text+=`\n${content}`:file.text=content;
                 return api.db.countries;
         }
         static capital(name){
                try {
                  return this.findBy('name_en',name)[0].capital;
                } catch (e) {
                  console.log(new Date(),`: Country with name "${name}" is NOT FOUND!`);
                }
         }
       }

          m.exports=_;
    })(rq('node-etl'),rq('jfile'))
})({},module,require)