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javascriptsymbols

JS Symbol as object key

I'm running a node software where in a certain context of the software there is an object which one of it's keys is a Symbol, and it's value is an object. For example:

object = {Symbol(symbol_name): another_object}

I'm trying to get to the 'another_object' keys and values and can't find the way to do so. Suggestions anyone?

Solution

  • The best approach would be to save the Symbol in a variable first, then just use bracket notation to look it up:

    const sym = Symbol('symbol_name');
const object = {[sym]: { foo: 'bar' }}

console.log(object[sym]);

    If you don't have a reference to the symbol, and the object contains only one symbol, you can get it with getOwnPropertySymbols:

    const object = {
  [Symbol('symbol_name')]: {
    foo: 'bar'
  }
};

const sym = Object.getOwnPropertySymbols(object)[0];
console.log(object[sym]);