javascript variable scope issue between two functions with callbacks

Question

I want to concat two arrays. In the code below i am only getting txs_history array.

getFirstArray(function(txs) {
    getSecondArray(function(txs_history) {
        txs.concat(txs_history);
        res.send(txs_history);
    });    
});

From my knowledge i can guess that txs var can't be read inside getSecondArray and that's why it is only sent txs_history. I can't figure out how to solve this scope issue.

Regards,

If txs wouldn't be in scope, you'd get an exception that says so. — Bergi
– Bergi, Commented Oct 14, 2014 at 17:08

jmar777 · Accepted Answer · 2014-10-14 17:04:15Z

2

txs is in scope, but txs.concat() returns a new array and leaves the original txs unmodified. What you want is probably this:

getFirstArray(function(txs) {
    getSecondArray(function(txs_history) {
        var combined = txs.concat(txs_history);
        res.send(combined);
    });    
});

answered Oct 14, 2014 at 17:04

jmar777

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