Array is not Pushing Data

@soomit wrote:

for(let i=0; i<=this.data_a.demo.length; i++)
      {
     this.finalalue.push(this.data_a.demo[i].category);
      }

It’s this.finalalue.push(this.data_a.demo[i].category); showing an error

_this.data_a.demo[i] is undefined

Please help me out.

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