What are the different key types in JavaScript objects?

What are the different key types in JavaScript objects?

In JavaScript, object keys can be strings or symbols. Strings are the most common, while symbols are unique and not enumerable.

Can you give me an example of using symbols as keys?

Sure! Here's an example:

const mySymbol = Symbol('mySymbol');
const obj = {
  [mySymbol]: 'value'
};
console.log(obj[mySymbol]); // Output: 'value'

Are there any limitations to using symbols?

Yes, symbols are not converted to strings, so they won't show up in for...in loops or Object.keys(), making them useful for private properties.

What about using numbers as keys?

In JavaScript, if you use a number as a key, it will be converted to a string. For example, obj[1] is the same as obj['1'].