将参数传递给async.js任务

Question

I have to iterate through a given JSON object and create a task for each object in there. The given tasks require information from this JSON object as well and I wonder how I can pass these information to my task so that it is available when executed.

Building my task array:

var asyncScrapeTasks = [];
var resources = JSON.parse(body);
for(var i=0; i<resources.items.length; i++)
{
    asyncScrapeTasks.push(function (callback)
    {
        console.log(resources.items[i].id);
    });
}

Executing my tasks:

async.parallelLimit(asyncScrapeTasks, 5, function() {
    callback(null, "Done");
});

My problem:

Right now console.log(resources.items[i].id); returns undefined, which makes sense for me, because the index i is not known at the time the functions being executed, but I wonder how I can solve my problem.

Answer 1

As I don't have enough reputation to add comment, I am writing as answer. Sorry.

Is there any specific reason to use paralleLimit? async.js have each which could iterate collection and perform operation on each item. This function applies the function iteratee to each item in collection, in parallel. async.js each

If you want to limit the operations: async.js eachLimit