Javascript filter, foreach, startsWith on array

Question

I need to be clarified on a little point, I'd like to filter an array only with some starting specific element.

I've tried something like this:

 const array = [{ "name": "NAME", "values": ["[John].[15]", "[Lois].[17]"] }]; const arrayFinal = array.filter(element => element.values.forEach(el => el.startsWith("[John]."))); console.log(arrayFinal);

But the printed array is empty. Do I miss something?

Thank you by advance

Answer 1

use some in place of forEach to return true if any of the element starts with [John]. As VLAZ already commented forEach doesn't return anything

 const array = [{ name: "NAME", values: ["[John].[15]", "[Lois].[17]"] }]; const arrayFinal = array.filter((element) => element.values.some((el) => el.startsWith("[John].")) ); console.log(arrayFinal);