Class Helper

compute (params, hash) public

Defined in packages/@ember/-internals/glimmer/lib/helper.ts:123

Available since v1.13.0

params

Array

The positional arguments to the helper

hash

Object

The named arguments to the helper

Override this function when writing a class-based helper.

recompute public

Defined in packages/@ember/-internals/glimmer/lib/helper.ts:90

Available since v1.13.0

On a class-based helper, it may be useful to force a recomputation of that helpers value. This is akin to rerender on a component.

For example, this component will rerender when the currentUser on a session service changes:

import Helper from '@ember/component/helper'
import { inject as service } from '@ember/service'
import { observer } from '@ember/object'

export default Helper.extend({
  session: service(),

  onNewUser: observer('session.currentUser', function() {
    this.recompute();
  }),

  compute() {
    return this.get('session.currentUser.email');
  }
});