For-loop order (with asynchronous function)

December 19, 2017, at 11:49 PM

I have this code :

exports.formatDepArrTables = function(jsonReturn, type, placeName, callback) {
    let toSend = "";
    if (type == 'departure') {
        for (let j = 0; j < jsonReturn.departures.length; j++) {
            console.log("DEPARTURES LOOP j = " + j + "/" + jsonReturn.departures.length);
            if(currentDeparture.display_informations.links[0] === undefined) {
                toSend += ""; // setting some string informations
            else {
                let oceTrainId = ""; // random number given by a json
                _this.getDisruptionFromDisruptionId(oceTrainId, function(data) {
                    for(let i = 0; i < data.disruptions[0].impacted_objects[0].impacted_stops.length; i++) {
                        if(currentImpactedStop.stop_point.label == placeName) {
                            toSend += "string";
        console.log("End of the first loop");
        return callback(toSend);
    } else if (type == 'arrival') {
        // copy&paste
    } else {
        throw new Error("not defined");

When I run this code (I use NodeJS), it makes 1/10, 2/10... from the first loop but it didn't iterate the second loop on the 1st iteration of the first loop (and it shows "End of the first loop" and starts the second loop).

getDisruptionFromDisruptionId is a custom method which makes a request (with 'request' NodeJS module) on an API.

Of course, I need to have informations given by getDisruptionFromDisruptionId to run my next loop...

Parent function of this code part is returning a callback that needs to be "filled" at the end of the both two loops.

Any ideas ?

Answer 1

request is async function, you need to add async / await to your code or use recursion

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