I was wondering how set the variable list as String.
const emails = [
{"ID": "11109", "VALUE": "financesss@123m.com", "TYPE_ID": "EMAIL"},
{"ID": "13429", "VALUE": "teste@testeeeee.com", "TYPE_ID": "EMAIL"}];
const list = emails.map(VALUE => VALUE.VALUE)
console.log(list) //desired result:: financesss@123m.com,teste@testeeeee.com
console.log(typeof list); //string
You can join an array into a single string with a delimiter by doing
const list = emails.map(VALUE => VALUE.VALUE).join(",");
The default delimiter for join is a comma (,) so you can express this as arr.join() should you wish.
See here for a definition of join: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/join