3 ms·

JS already supports immutable objects, by using Object.freeze().

• spankalee 9y ago
  That's not deeply immutable like you'd want for sharing objects across threads, or even for using in contexts like React and Redux.
  • phailhaus 9y ago
    Not too hard to call Object.freeze() recursively to get the deep immutability you need. And of course there's ImmutableJS for other immutable data structures.
• bzbarsky 9y ago
  That doesn't really make things immutable. Even ignoring the deep vs shallow issue, consider what effect Object.freeze has on a JS Map (hint: none, really; you can still add/remove things).
  • phailhaus 9y ago
    Right, that's where libraries like ImmutableJS come in.