Ability to set multiple values at once

[RReverser]

When you need to add multiple values, there is little sense in doing separate operations (and also creating intermediate objects) like:

const a = ImmutableMap([['x', 1], ['y', 2]]);
const b = a.set('z', 3).set('t', 4);

It would be nice to have .extend method that would allow to do things like:

const a = ImmutableMap([['x', 1], ['y', 2]]);
const b = a.extend({z: 3, t: 4}); // or a.extend(#{z: 3, t: 4});

[skrat]

I believe this is something that can be handled by a merge operation. extend is surely confusing and hugely overloaded term.

[RReverser]

@skrat merge also doesn't exist at the moment. I don't care whether it will be called merge, extend or assign, the functionality is what's interesting.

[Gozala]

I believe ideas is that spread operator will handle that:

const b = #{ ...a, z: 3, t: 4};

[ckknight]

@Gozala: That applies to Record, not ImmutableMap.