Collections

unionBy

Combine record sets with first-record precedence.

Use it in your component

Standalone component

import { Component } from '@angular/core';
import { JsonPipe } from '@angular/common';
import { UnionByPipe } from 'extra-pipe';

@Component({
  standalone: true,
  imports: [UnionByPipe, JsonPipe],
  template: `{{ [{"id":1}] | unionBy: [{"id":1},{"id":2}]: "id" | json }}`,
})
export class ExampleComponent {

}

Template

{{ [{"id":1}] | unionBy: [{"id":1},{"id":2}]: "id" | json }}

Try it live.

The output below runs the packed library. Edit data, not code.

Input (JSON)Use double quotes for text, or a number, array, object or null.

Parameters (JSON array)Ordered parameters: other, key. Locale is controlled separately.

Output localeThis pipe has no locale override.

Live template data

readonly value = [
  {
    "id": 1
  }
] as const;
readonly parameter0 = [{"id":1},{"id":2}] as const;
readonly parameter1 = "id";
{{ value | unionBy: parameter0: parameter1 | json }}

Rendered output

[
  {
    "id": 1
  },
  {
    "id": 2
  }
]