RxJS Array Transformation

rxjs-array-xform.ts

let result;
from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]).pipe(
  map(n => n * 2),
  filter(n => n > 4),
  map(n => ' Num: ' + n),
  reduce((acc, str) => acc + str, 'Start:')
).subscribe(r => result = r);
console.log(result); // Start: Num: 6 Num: 8 Num: 10 Num: 12 Num: 14 Num: 16 Num: 18 Num: 20