Remember.js

remember.js

"use strict";

function remember(...args){
    const [key, value] = args;
    
    if(args.length === 1){ // recall
        return new Promise(resolve => {
            setTimeout(() => {
                const val = localStorage.getItem(key);
                
                try{ resolve(JSON.parse(val)) }
                catch(e){ resolve(val); }
            })
        });
    }
    
    if(args.length === 2){ // retain
        return new Promise( (resolve, reject) => {
            setTimeout(() => {
                let toStore = value;
                try{ if(Object(value) === value) toStore = JSON.stringify(value); }
                catch(e){ reject(e) }
                
                try{
                    localStorage.setItem(key, toStore);
                    resolve(key);
                }
                catch(e){ reject(e); }
            })
        });
    }
}

function forget(key){
    return new Promise( (resolve, reject) => {
        setTimeout(() => {
            try{
                resolve(localStorage.removeItem(key))
            }
            catch(e){
                reject(e);
            }
        })
    });
}

remember('yo', {a: 25});
remember('yo').then(({a}) => console.log(a));
forget('yo')

Nice !