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I'm trying to add new elements to an Array but it keeps overwriting it the first element, i'm not sure if i'm doing it correctly, but this is my code:

push method is ok for you. It will add elements at the end of the array. If you have data already setted in your array, then remove this.nArray = because this is creating a new empty array, deleting all previous data stored in nArray variable. In any case, if you want to add elements at the beginning try unshift: this.nArray.unshift(this.data);.

If you push data inside nArray you will get an array of array of objects. Maybe you are looking to add only the elements in data and not the whole array. Use concat method for that.

this.nArray.push(this.nArray.concat(data));

Or a shorten syntax using spread operator ...:
this.nArray.push(...data);

NOTE:
I'd recommend you to use const for your array definition and remove the blank assignment of in nArray. Also, instead of using concat, use the spread operators with the push method.

As it is, you are pushing an array to an empty array. So, there is nothing like overriding here. However, assuming this.nArray is filled with some elements already, you should use the spread syntax for concatenating two arrays like:

Use concat when you want to merge two arrays.

You can now use the new merged array for your purpose

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