Why line 27 is executed before line 24 ?????

searchUtils.js

const Docker = require('dockerode');
const docker = new Docker({
    socketPath: '/var/run/docker.sock'
});

// CONSTRUCTOR
function SearchUtils() {
    this.listContainersPromise = docker.listContainers({all: true});
    this.scraperListId = [];
}

// "METHODS"
SearchUtils.prototype.run = function() {
    this.getScraperContainersListPromise()
        .then((containers) => {
            for (let i = 0; i < containers.length; i++) {
                if (containers[i].Names.toString().indexOf("scraper") !== -1) {
                    this.addToScraperList(containers[i].Id, "wait");
                }
            }
        })
        .then(()=>{
            return this.checkReadyScraper();
        })
        .then(() => {
            return this.scrap();
        })
        .catch(e => console.log(e));
};

SearchUtils.prototype.checkReadyScraper = function() {
    return new Promise ((resolve, reject)=> {
        for (let i = 0; i < this.scraperListId.length; i++) {
            this.exec("getStatus", this.scraperListId[i].id);
        }
        resolve("ok");
        // TODO ADD EROR STRATEGY
        reject("error")
    });
};

SearchUtils.prototype.getScraperContainersListPromise = function() {
    return this.listContainersPromise;
};

SearchUtils.prototype.exec = function(type, containerId){
    let container = docker.getContainer(containerId);
    if (type === "getStatus"){
        return this.runExec(container, 'cat /home/immobot/status');
    }
    else if (type === "scrap") {
        return this.runExec(container, 'torify scrapy crawl seloger -o seloger.json');
    }
};

SearchUtils.prototype.scrap = function() {
    return new Promise ((resolve, reject)=> {
        let localRdyScraperList = [];
        for (let i = 0; i < this.scraperListId.length; i++) {
            if(this.scraperListId[i].status.toString('utf8').indexOf("ready") !== -1){
                localRdyScraperList.push(this.scraperListId[i].id);
            }
        }
        console.log("test de localRdyScraperList : "+localRdyScraperList);
        // this.exec("scrap", this.scraperListId[i].id);
        resolve("ok");
        // TODO ADD EROR STRATEGY
        reject("error")
    });
};

SearchUtils.prototype.addToScraperList = function(containerId,status) {
    this.scraperListId.push({id: containerId, status: status});
};

SearchUtils.prototype.getScraperList = function() {
    return this.scraperListId;
};

SearchUtils.prototype.getScraperList = function() {
    return this.scraperListId;
};

SearchUtils.prototype.runExec = function (container, cmd) {
    return new Promise ((resolve, reject)=>{
        let options = {
            Cmd: [ '/bin/bash', '-c', cmd ],
            AttachStdout: true,
            AttachStderr: true
        };

        container.exec(options, (err, exec) => {
            if (err) return;
            exec.start((err, stream) => {
                if (err){
                    console.log("error : "+err);
                    return;
                }

                // container.modem.demuxStream(stream, process.stdout, process.stderr)

                if (cmd === "cat /home/immobot/status"){
                    let newStream = require('stream');
                    let logStream = new newStream.PassThrough();
                    logStream.on('data', (chunk) => {
                        // console.log(chunk.toString('utf8'));
                        if (chunk.toString('utf8').indexOf("ready") !== -1){
                            console.log("CONTAINER READY !!");
                            //EDIT CONTAINER STATUS IN SCRAPERLIST TO READY
                            this.changeStatusToReady(container.id);
                        }
                    });
                    container.modem.demuxStream(stream, logStream, process.stderr);

                }
                else if (cmd === "torify scrapy crawl seloger -o seloger.json"){
                    console.log("on lance le scrape sur un des scraper rdy");
                    container.modem.demuxStream(stream, process.stdout, process.stderr)
                }

                // container.modem.demuxStream(stream, logStream, process.stderr);

                exec.inspect(function(err, data) {
                    if (err){
                        console.log("error : "+err);
                        return;
                    }
                });
            });
        });
        resolve("ok");
        // TODO ADD EROR STRATEGY
        reject("error")
    });
};

SearchUtils.prototype.changeStatusToReady = function (containerId){
    for (let i = 0; i < this.scraperListId.length; i++) {
        if(this.scraperListId[i].id === containerId){
            this.scraperListId[i].status = "ready";
        }
    }
    // console.log(this.getScraperList());
};

module.exports = SearchUtils;

2017-09-13T09:13:35.715052259Z test de localRdyScraperList :
2017-09-13T09:13:35.759151784Z CONTAINER READY !!
2017-09-13T09:13:35.793932539Z CONTAINER READY !!
2017-09-13T09:13:35.843496373Z CONTAINER READY !!