使用节点异步并行回调

Question

I have few functions that can be executed in parallel. Using async.parallel() works fine, but it executes the main callback when an error is received.

As the functions are independent, I still want results from others even though on has error.

Here's my current code. Is there another async function for my need?

var async=require('async');
async.parallel({
    one:function(callback)
    {
        callback(null,1);
    },
    two:function(callback)
    {
        callback("ERROR Occured");
    },
    three:function(callback)
    {
        callback(null,3);
    },
    four:function(callback)
    {
        callback(null,4);
    }
},function(err,result)
{
    console.log(err);
    console.log(result);
});

Answer 1

You can use reflectAll :

var async = require('async');

async.parallel(async.reflectAll([
  function(callback) {
    callback(null,1);
  },
  function(callback) {
    callback("ERROR Occured");
  },
  function(callback) {
    callback(null,3);
  },
  function(callback) {
    callback(null,4);
  }
]), function(err,result) {
  console.log(err);
  console.log(result);
});

How this works is explained here :

Wraps the function in another function that always returns data even when it errors. The object returned has either the property error or value .