rxjs Operator: map / select Using a transform function


Example

const source = Rx.Observable.range(1, 3)
  .map(x => x * x);

const subscription = source.subscribe(
  x => console.log(`Next: ${x}`),
  err => console.log(`Error: ${err}`),
  () => console.log(`Completed`)
);

// => Next: 1
// => Next: 4
// => Next: 9
// => Completed