simple storage class for javascript - test included

storage.js

class Storage {

    static get(key) {
        let value = localStorage.getItem(key);
        return value === null ? null : JSON.parse(value);
    }

    static set(key,value) {
        return localStorage.setItem(key,JSON.stringify(value));
    }

    static unset(key) {
        if(this.isset(key))
            return localStorage.removeItem(key);
        else
            return null;
    }

    static clear() {
        return localStorage.clear();
    }

    static isset(key) {
        return this.get(key) !== null;
    }

}

let a = {
    "a": 15,
    "t": 12
};

let b = 5;

let c = 'Hello';

let d = true;

let e = [5,5,8,9];

Storage.set('object',a);
Storage.set('int',b);
Storage.set('string',c);
Storage.set('boolean',d);
Storage.set('array',e);


console.log('Getting object :');
console.log(Storage.get('object'));

console.log('Getting int : ');
console.log(Storage.get('int'));

console.log('Getting string : ');
console.log(Storage.get('string'));

console.log('Getting boolean :');
console.log(Storage.get('boolean'));

console.log('Getting array : ');
console.log(Storage.get('array'));

console.log('settings cat to tom.');
Storage.set('cat','tom');
console.log('checking if cat is set ( expecting true ) :');
console.log(Storage.isset('cat'));
console.log('unset cat.');
Storage.unset('cat');
console.log('checking if cat is set ( expecting false ) :');
console.log(Storage.isset('cat'));
console.log('settings a to b');
Storage.set('a','b');
console.log('settings b to c');
Storage.set('b','c');
console.log('checking if a & b are set ( expecting true - true ) :');
console.log(Storage.isset('a'));
console.log(Storage.isset('b'));
console.log('cleaning storage');
Storage.clear();
console.log('checking if a & b are set ( expecting false - false ) :');
console.log(Storage.isset('a'));
console.log(Storage.isset('b'));