How to push an element into a typescript array [duplicate]

Question

I made an array of type dataRows which is an interface

dataArray: Array<dataRows>;

then in a function I pushed a dataRows object into it

this.dataArray.push(row)

so why do I get Cannot read property 'push' of undefined in the console?

The array mus tbe initialized before accessing it's methods/properties: dataArray: Array<dataRows> = [];. — Barremian
– Barremian, Commented Aug 21, 2020 at 14:41

Luke Storry · Accepted Answer · 2020-08-21 14:45:26Z

1

You are most likely getting the error Cannot read property 'push' of undefined because your dataArray hasn't been defined yet, and is thus undefined - a blank object with no methods.

You need to initialise it with an empty array, like:

dataArray: Array<dataRows> = [];

to then be able to use the .push method to append your row to it.

answered Aug 21, 2020 at 14:45

Luke Storry

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