How can I call callback function in async.eachSeries callback function

Question

I'm trying to call callback function after eachSeries is done, but IT doesn't work at all. It doesn't print 2 that's supposed to print when It's called but It prints 4 after first function is called. Is there any idea about it? Thank you!

async.waterfall([
      function(callback) {
        console.log("1");
        let eroJson = [];
        rp(optForReddit).then(function(redditJSON) {
          let posts = redditJSON.data.children;
          async.eachSeries(posts, function(item, callback) {
            if (isVideo(item.data.url)) {
              eroJson.push(getAlbumId(item.data.url));
            }
            callback(); // callback function after eachSeries
          }, function() {
            callback(eroJson); // call next callback
          });
        })
      },
      function(redditJSON, callback) {
        console.log("2");
        callback() // call another function
      }
)],
     function(){
         console.log("Last one");
     }

);

Answer 1

Change the callback names. it seems like you are overriding callback Names

    async.waterfall([
          function(waterfallCallback) {
            console.log("1");
            let eroJson = [];
            rp(optForReddit).then(function(redditJSON) {
              let posts = redditJSON.data.children;
              async.eachSeries(posts, function(item, callback) {
                if (isVideo(item.data.url)) {
                  eroJson.push(getAlbumId(item.data.url));
                }
                callback(); // callback function after eachSeries
              }, function() {
                waterfallCallback(eroJson); // call next callback
              });
            })
          },
          function(redditJSON, waterfallCallback) {
            console.log("2");
            waterfallCallback();
          }
    )], function(){
            console.log("Done executing all waterfall functions");
    });