Question

I am 100% sure there must be some simple answer but today I suck at googling. Question within the code.

async.waterfall([
  function(callback){
    callback(null, 'some value..');
  }
  ],
  function (err, result) {
    // how do I get result outside of this block?
   }
);

If I set a variable outside this block and try to assign “result” to it, it does not make out of the block because of the nature of JavaScript scopes..

Thanks!

Answer 1

Thanks everyone for your answers. What I’ve done – I’ve switched to a module called “step” instead. It lets me do the following:

step = require('step');

var responseData = '{"a":1, "b":2}';

step(
  function someFunction1 () {
    // We do something here and return the result
    return '3';
  },
  function someFunction2 (err, result) {
    // We try to modify the variable that has been defined outside this block
    responseData.c = result;
  }
);

// responseData now returns {"a":1, "b":2, "c":3}

Maybe I could have done something like this with async as well – I don’t know. But the above works just the way I wanted.