json breadcrumb/path

[qoby]

This creates a json path, as knowing where you are in an object can be very important.

let obj = { first: second: third: fourth: true };

whenTraverse(obj, 
  enter: function(node, key, parentNode, path) {
      console.log(path);
  });

would output:

['first']
['first', 'second']
['first', 'second', 'third']
['first', 'second', 'third', 'fourth']

Not tested very thoroughly, just wanted to get it out to see if it would stick and because I need the functionality right now.

On another note, is there any reason you don't just bind a context object to each function?

context = { parentNode, key, ... }
promise.bind(context)

This way, the function argument could be the node as it currently is, and each chained promise would be returning only what it received:

.then( function(node) { return node; } )

Other properties would be available as this.parentNode, etc.