How to use the falcor.Observable function in falcor

var Keys = require('../Keys');
var Precedence = require('../Precedence');
var Observable = require('falcor').Observable;
var PrecedenceProcessor = {
    execute: executeByPrecedence
};
module.exports = PrecedenceProcessor;

function executeByPrecedence(paths, matches, method, context, valueObject) {

    // process until there are no more paths or no more matches.
    var matched;
    var newPerms;
    var matchedPaths;
    var i = 0;
    var generatedResults;
    var results = [];
    while (paths.length && matches.length) {
        matched = matches.shift();