Angular2 find does not exist on Array

Question

I have an angular2 project (2.0.0) using typescript 2.0.4.

I have this code:

var assignedIds: Array<string> = this.AssignedUsers.map(u => u.id);
var users = this.AllUsers.filter(all => all.id != assignedIds.find(id => id == all.id));

I'm getting an error on the find method:

Property 'find' does not exist on type 'string[]'.

I get this error on several arrays - not just this one. A couple are number[], one is string[], and one it a custom object.

If I compile to es6 it works but I need to target es5.

Do I need some typings?

You need a polyfill (see here), as you do anytime you want to use an es6 feature (like Array.find) in an environment that only supports es5 — drew moore
– drew moore, Commented Oct 14, 2016 at 19:56
Do I need to make a polyfill? I thought Angular2 had a solution for this that didn't require custom code. — Don Chambers
– Don Chambers, Commented Oct 14, 2016 at 20:15

Community · Accepted Answer · 2017-05-23 11:46:48Z

2

find() did not exist in ES5, so you get the error. You can solve that with a polyfill (as mentioned in a comment).

However, you actually should simply your code:

var assignedIds: Array<string> = this.AssignedUsers.map(u => u.id);
var users = this.AllUsers.filter(all => assignedIds.some(id => id == all.id));

edited May 23, 2017 at 11:46

CommunityBot

11 silver badge

answered Oct 14, 2016 at 19:59

Amit

46.5k9 gold badges84 silver badges114 bronze badges

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

Collectives™ on Stack Overflow

Angular2 find does not exist on Array

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related