Subscribing to Observables created with from()

from-subscription.ts

letter$.subscribe(letter => console.log(letter));
// Output: "R","x","J","S"," ","i","s"," ","c","o","o","l"

fruit$.subscribe(console.log);
// Output: "Strawberry", "Cherry", "Blackberry"

pokemon$.subscribe(console.log);
// Output: ["Squirtle", "Water"], ["Charmander", "Fire"], ["Bulbasur", "Grass"]

promise$.subscribe(promise => console.log(promise));
// Output "I promise to start learning RxJS"

node$.subscribe(node => console.log(node));
// Output: HTMLParagraphElement {tagName: "p", attributes: {...}}