max

The Max operator operates on an Observable that emits numbers (or items that can be compared with a provided function), and when source Observable completes it emits a single item: the item with the largest value.

Examples

Get the maximal value of a series of numbers

import { of, max } from 'rxjs';

of(5, 4, 7, 2, 8)
  .pipe(max())
  .subscribe(x => console.log(x));

// Outputs
// 8

Use a comparer function to get the maximal item

import { of, max } from 'rxjs';

of(
  { age: 7, name: 'Foo' },
  { age: 5, name: 'Bar' },
  { age: 9, name: 'Beer' }
).pipe(
  max((a, b) => a.age < b.age ? -1 : 1)
)
.subscribe(x => console.log(x.name));

// Outputs
// 'Beer'