filter and regex issue-CodePudding

I want to filter an array with a function.

if (this.pendingItems.customer?.emailAddresses) {
  this.pendingItems.customer.emailAddresses.filter(email => {
    isEmailValid(email);
  });
}

the function isEmailValid()

export function isEmailValid(s: string): boolean {
  const re =
    /^[a-z0-9 -][a-z0-9_ -]*(\.[a-z0-9_ -] )*@([a-z0-9-] \.) [a-z0-9-]{2,}$/i;
  return re.test(s);
}

return the correct response (true or false) with the emails([email protected] and test2email) I pass it, but the filter don't work.

CodePudding user response：

You need to modify your expression slightly. The method you pass to the filter function should return true/false but it always returns void (which will be cast to false).

filter(email => isEmailValid(email))
or
filter(isEmailValid)
or
filter(email => { return isEmailValid(email) })

In case you missed it - you forgot to return the result of the isEmailValid ;)

CodePudding user response：

when you use filter you will get back the valid emails but if you want to get email and bool you can use map

.map((email) => { console.log(email,isEmailValid(email) });

https://jsfiddle.net/1h7vno3b/92/