CODEWITHSUNDEEP
javascriptarraysreactjsobject
Christina Stebbins
Christina Stebbins

Reputation: 488

Cannot access the actual value of a Javascript array of constructed objects - returns undefined

I have created an array of objects of the form

const objectOne = {
    name: 'NameOne',
    data: [{x: 'dataOneX', y: 'dataOneY'},{x: 'dataTwoX', y: 'dataTwoY'}]
};
const objectTwo = {
    name: 'NameOne',
    data: [{x: 'dataOneX', y: 'dataOneY'},{x: 'dataTwoX', y: 'dataTwoY'}]
};
const newArr: [objectOne, objectTwo]

I then pass newArr into a component as a prop:

< LineChart title='title' data={newArr} />

Within the component, I try the following: console.log(data) and I get my array in the console. However, console.log(data[0].name) returns undefined, and data[0] returns the name of the original object I passed in. I am trying to access the data in this way so that I can test dynamically pulling from an API and passing the information into apexcharts. However, this is a hard obstacle for me - I am new to JS (and react.js which is what I am using).

Happy to clarify!

EDIT:

My actual code is:

 const components = [
    {
      title: 'Headcount',
      data: [{ objectOne }, { objectTwo }]
    }
 ]

<LineChart
    title="Title"
    xtype="category"
    data={components[0].data}
/>

And the following is what it is passed into:

function LineChart({ title, data }) {
  console.log(data);
  data.forEach((datum) => console.log(datum.name));
  return(
    <Box>
      <Typography>{title}</Typography>
    </Box>
  ));
}

export default LineChart;

The issue I am having is data.forEach((datum) => console.log(datum.name)) returns undefined but data is exactly as I expect it in the console.

Upvotes: 1

Views: 57

Answers (1)

Christina Stebbins
Christina Stebbins

Reputation: 488

Gabriele Petrioli answered the question in the comments:

Do not do data: [{ objectOne }, { objectTwo }]. Use data: [objectOne , objectTwo ]. (remove the curly brackets). The { objectOne } creates an object with a property named objectOne whose value is the contents of the objectOne variable

Upvotes: 1

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