An adapter is used to define custom behavior for fundamental operations (e.g. property lookup, assignment, enumeration, function invocation, etc). Similar to the concept of proxy, an adapter is a function that return an object whose properties are functions which define the behavior of the proxy when an operation is performed on it.
Here's a simple example:
var store = datastore({}, adapter)
store.set('name', 'olivier')
store.get('name') // => hello olivier
function adapter(data) {
return {
set: function(target, key, value) {
target(key, 'hello ' + value)
}
}
}The methods set, pull, has and del of the datastore can be overridden by the adapter. The target is a fallback to the regular behavior of a datastore (in-memory storage) and has to be called to resolve the promises returned by these methods.