path-lookup

lookup path within object.

Installation

Install with component(1):

$ component install yields/path-lookup

Example

{
  user: {
    first_name: 'john'
  }
}

// lookup

var path = lookup(obj, 'User.FirstName', [lower, snake]);
path; // => "['user']['first_name']"

// get
Function('_', 'return _' + path)(obj); // => "john"

// set
Function('_, v', '_' + path + ' = v')(obj, '');

// get
Function('_', 'return _' + path)(obj); // => ""

// delete
Function('_', 'delete _' + path)(obj); // => true

// get
Function('_', 'return _' + path)(obj); // => undefined

API

lookup(obj, path, fns)

Lookup path within obj invoking fn(key) for each key that wasn't found the functions should return other possibilities for a key.

return a string path or null

lookup.keys(obj, path, fns)

Same as lookup() but returns an array of keys or null.

caveats

you should probably make sure the path exists, before doing anything that will throw.

you can either keep cache of path's and their state { path: '...', exists: true } or just wrap stuff that will throw in a try {} catch {} block.

License

MIT