Add new object to array

Question

I'm struggling to push a new object into an array. At the moment the code below seems to be simply overwriting a single object. I can see the data I want to push to the array going through the console but it's just not storing a new object. Any ideas?

fs.readFile('check.json', function (err, check) {
    if (err) throw err;
    var newData = JSON.parse(check);

    var tempData =[];
    for (var index=0; index<newData.length; index++){
        tempData.push(newData);
        }
    tempData = newData;
});

You are assigning the last element to the array at the end? tempData = newData; — Reinard
– Reinard, Commented Oct 15, 2015 at 21:26
you're overwriting the tempData array by assigning it with newData in the last line — Kiz
– Kiz, Commented Oct 15, 2015 at 21:27

Travis J · Accepted Answer · 2015-10-15 21:26:40Z

3

The typical approach for iterating arrays and then pushing objects to them would be this

var tempData =[];
for (var index=0; index<newData.length; index++){
    tempData.push(newData[index]);
    //                     ^add index
}
//tempData = newData; remove assignment which overwrites array

answered Oct 15, 2015 at 21:26

Travis J

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1 Comment

Rhys Edwards Over a year ago

Thanks. Can you offer any insight into how that pushes externally with fs? The external json comes back as undefined. Travis J

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