Question

170

node.js async series function's arguments

rated 0 times [ 177] [ 7] / answers: 1 / hits: 9517 / 11 Years ago, wed, january 22, 2014, 12:00:00

I need to do the code like following:

function taskFirst(k, v) {

    console.log(k, v);

}



function taskSecond(k, v) {

    console.log(k, v);

}



function run() {

    var g1 = Something;

    var g2 = Something;

    var g3 = Something;

    var g4 = Something;



    async.series(

        [

            taskFirst(g1, g2),

            taskSecond(g3, g4)

        ],

        function(error, result){



        }

    );

}

What is the right way to pass custom variables and async.js callback function?

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rashawn

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answered 11 Years ago rocioblancac · Accepted Answer

You could do something like this:

function taskFirst(k, v, callback) {

    console.log(k, v);



    // Do some async operation

    if (error) {

        callback(error);

    } else {

        callback(null, result);

    }

}



function taskSecond(k, v, callback) {

    console.log(k, v);



    // Do some async operation

    if (error) {

        callback(error);

    } else {

        callback(null, result);

    }

}



function run() {

    var g1 = Something;

    var g2 = Something;

    var g3 = Something;

    var g4 = Something;



        async.series(

            [

                // Here we need to call next so that async can execute the next function.

                // if an error (first parameter is not null) is passed to next, it will directly go to the final callback

                function (next) {

                    taskFirst(g1, g2, next);

                },

                // runs this only if taskFirst finished without an error

                function (next) {

                    taskSecond(g3, g4, next);    

                }

            ],

            function(error, result){



            }

        );

}