expressionjs-path

Path

Handles watching a scope for simple and complex paths.

For example, here are some simple expressions:

title
count > 10
isLoggedIn ? "Log out" : "Log in"
user.name

These create a simple list of "edges":

[ 'title' ]
[ 'count' ]
[ 'isLoggedIn' ]
[ 'user', 'user.name' ]

Those edges can then be used as keys to point to an accessor. You can then attach event listeners to the accessors. What's important is that, a scope has a bunch of accessors, which are stored by the edge/key above (so like { 'user.name': accessor }).

You can swap out data without having to recreate anything or modify any event listeners. This is ideal for performance. This means that a scope + accessor is a shell for data.

Here are some complex expressions where the path dynamically changes based on something inside of the [] square brackets:

user[attr.name]

For these ones, if attr or attr.name changes, user[attr.name] might evaluate to a totally new property. So this Path module helps abstract this all away for you.

Install

node:

$ npm install expressionjs-path

browser:

$ component install expressionjs/path

Licence

MIT