ES6 object tree walk generator

objectwalk.js

/* # use >> for( node of Object.walk( yourObject )) console.log( node )

 # or more >>

 let walk=[]; for( node of Object.walk( yourObject , o => isHaveRoutes( o ) )  ) if(isProperWay(node)) walk.push( node )
 
 # recursive generator for Object, avoide  circular structure by set.

*/

Object.walk = function* ( po , fil , set ) {
  fil = fil || (()=>true) 
  set = set || new Set()
  if ( po instanceof Object && !set.has(po) && fil(po) ){ 
  	set.add( po )
    yield po
    for(let key of Object.keys( po , set )){  yield* Object.walk( po[key] , fil , set  ) }
  }  
}

// filterless version
export function * walker(object, set = new Set()) {
  if (object instanceof Object && !set.has(object)) { 
    set.add( object );
    yield object;
    for ( let key of Object.keys(object , set)) {
      yield * walker(object[key], set );
    }
  }
}