how to serialize symbols in JavaScript

serializeSymbols.js

const reserializer = (mapping) => {
   const map = new Map();
   Object.keys(mapping).forEach(k => map.set(mapping[k], k));
   return {
      serialize: value => map.get(value),
      deserialize: value => mapping[value],      
   }
}

// application
let savedState;

function startApp() {
   const a = Symbol();
   const b = Symbol();
   const c = Symbol();
   const {serialize, deserialize} = reserializer({a, b, c});   
   if (savedState) {
      const state = JSON.parse(savedState).map(deserialize);
      console.log('restored: ', state);
      console.log(state[0] === a)
      console.log(state[1] === b)      
      console.log(state[2] === b)      
      console.log(state[3] === c)            
   } else {
      savedState = JSON.stringify([a, b, b, c].map(serialize));
   }
   
}

startApp();

console.log('saved state', savedState)

startApp(savedState);




// 

For any search engine traveller, keep looking. This ain't it

I doub't you'll find something vastly different. Though improvement over this snippet would be using of some kind of UUID generated for particular symbols (symbol is just unique identifier, so it would be natural to convert it to some kind of UUID and when deserializing - and then recreate Symbol() from string based UUID).