Populate objects from inside callbacks

Question

Populate objects from inside callbacks

Quite simply, it is possible to populate the object symbols from inside the callbacks?

Cursed closures of javascript!

var symbols = {};
markets.find(function(err, markets) {
   for(var market in markets) {
     symbols[markets[market].symbol] = markets[market].label;
   }
});

console.log(symbols);

javascript
node.js
mongoose

Answer 1

async/waterfall is the right solution for this problem. And since .find() is asynchronous, you can do a forEach as well:

markets.forEach(function(m) {
  symbols[m.symbol] = m.label;
});