Take a changes array in the format produced by Object.observe
and Array.observe
, and apply those changes to another object.
There's many 'changeset' formats floating around, might as well conform to a format built into JavaScript itself.
var apply = require('apply-changes')
var localUser = {
name: 'Original'
}
var remoteUser = {
name: 'Original'
}
Object.observe(localUser, function(changes) {
apply(remoteUser, changes)
console.log(remoteUser.name) // 'Updated'
console.log(localUser.name === remoteUser.name) // true
})
localUser.name = 'Updated'
Say you have an environment where Object.observe
is implemented (e.g.
node 0.11.x), and you want to easily replicate changes to another environment
perhaps one without Object.observe
(e.g. vintage
2013 web browser). In this scenario, you could send a raw stream of changes
directly from Object.observe
callback to observe-apply
to have
changes applied in the other environment.
The recipient of the changes must be treated as read-only.
apply-changes
does not verify the state of recieving object matches the state
of source object. Updates are likely to corrupt data if you change the recipient
object.
MIT