Adding an empty object between each line in a typescript array

Question

I'm creating an iterator with the .map() function like so:

var csv = this.invoices
  .map(x => ({
    invoiceId: x.invoiceId,
    invoiceDate: x.invoiceDate,
    invoiceType: x.invoiceType,
    amount: x.subtotal,
  }));

I'm going to be exporting this array to a CSV, and need to have a blank line between items. The CSV helper doesn't do this, so how do I add in an empty object between each item in my csv array?

CertainPerformance · Accepted Answer · 2022-02-27 23:02:35Z

3

One option would be to flatMap instead of map, and add an empty object to the front or back of the array, then pop or shift accordingly.

var csv = this.invoices
  .flatMap(x => [
    {},
    {
      invoiceId: x.invoiceId,
      invoiceDate: x.invoiceDate,
      invoiceType: x.invoiceType,
      amount: x.subtotal,
    }
  ]);
csv.shift();

answered Feb 27, 2022 at 23:02

CertainPerformance

373k55 gold badges354 silver badges359 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Robbie Mills Over a year ago

Exactly what I needed, thank you!

JSmart523 Over a year ago

I like this! I'm embarrassed that my first thought was using iterators. ( developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… ) so that you're not creating yet another array, but while it would be better "in theory", simple beats clever every time!

Collectives™ on Stack Overflow

Adding an empty object between each line in a typescript array

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related