Creating an Observable with from()

from.ts

// Creating an Observable from an array of strings
const fruit$ = from(["Strawberry", "Cherry", "Blackberry"]);

// Creating an Observable from a Map object
const pokemon$ = from(
  new Map([
    ["Squirtle", "Water"],
    ["Charmander", "Fire"],
    ["Bulbasur", "Grass"]
  ])
);

// Creating an Observable from a promise
const promise$ = from(Promise.resolve("I promise to start learning RxJS"));

// Creating an Observable from a nodeList
const node$ = from(document.querySelectorAll("p"));