Testing async.js callback behavior when returning errors.

Results

Processing 1
Processing 2
Processing 3
Processing 4
Processing 5
[Error: Exploding on 5]
Processing 6
Processing 7
Processing 8
Processing 9
Processing 10

test.js

var async = require('async');

var boomArray = [1,2,3,4,5,6,7,8,9,10];

async.each(boomArray
, function(e, fn) {
    console.log('Processing ' + e);
	
	if (e === 5) {
		return fn(new Error('Exploding on 5'));
	}
	else {
		return fn(null);
	}
}
,	function(err) {
		if (err) console.log(err);
		else console.log('completed');
	}
);